Diclaimer: I don't own Sailor Moon or any of the charactors asociated with the Anime or Manga, Nor do i own anything asociated with Harry Potter. Except for King Tranquility he's mine.
Prolouge - version 4 added some bits removed a few sentances

The light shone peacefully down on the large courtyard, people dressed in ballgowns danced to the music of a small group of musicians, many would have expected there to be more musicians at a gathering this large but listening to them play was magical, each note carried perfectly on the air. Crystal balls floated above the dancers casting light down. To the right of the dance floor were two thrones, one of which was empty and in the other sat a silver haired woman with a small child in her lap, both wore silver gowns with their hair up in buns with a long streamer of hair coming from each bun. She was Queen Serenity the fifth while the girl in her lap was Tiera her daughter and next inline for the thrown and the title of Serenity.

On the left side of the dance floor was the entrance back into the castle and above the doorway was a large balcony where a man stood leaning on the baulstrade he was dressed in the same formal wear as the rest of the people below but instead of looking happy his face held a somber look.
"Are you alright my King?" a female voice asked and the man turned to see a woman in a sailor fuku with a dark blue skirt, and bow, her hair was long and very dark but shined with a hint of red, in her hand she carried a key shaped staff.
"Pluto, time is changing it is almost time for me to vanish completly"
"My king?" The senshi gasped in horror "I haven't seen anything in the Timegates that would indicate you leaving."
"Dear Pluto i made those gates i can control what they show, i simply asked them to not let you know, i know how this will affect you my dear"
"Why? why vanish completly?" she asked "My time has ended, My grandaughter will rule well, but she is not ruling if i am there to sit and look over her shoulder all the time."
"But my King she doesn't even know you are her Great grandfather, I alone know who you are King Tranquility"
"Tranquility" the Man repeated before taking a sip of his drink "My title but not my name, I haven't used my name in so long perhaps to long. I never thought i would live this long. When i was a child i would dream of exploring the universe meeting new races finding things never seen before, using my gifts to help others and in the end i created an empire"
"An Empire which will last thousands of years" Pluto said with a slight smile.
"Yes but in creating this i lost myself along the way, i ended up collaring myself i have no freedom here chained to one planet. Do not misunderstand me Pluto i love the Silver Empire but i have grown weary of acting as an advisor going to meeting and balls i want to go exploring again. Release the chains and let me go." Tranquility told her his green eyes dancing with tempered fire and his long black hair moving in a non existant breeze.
"Where will you go?" Pluto asked quietly.
"The Vashti have offered me a place teaching at a new school for magic it's just opened up i want to be a part of it teach the next generation."
"The Vashti? I wasn't aware you were on good terms with them"
"The Vashti live a very long time and some are still my friends from when we began the alliance, it will do me good i think to teach for a while"
"My king, if you leave i don't think i can carry on as Sailor Pluto, you've been the constant in my life since i was a child i don't know what i would do if you were gone, i would follow you anywhere."
"Pluto, no, Elisa listen to me You are Sailor Pluto guardian of Time, Princess of Pluto, you cannot turn your back on that. I did not raise you to turn your back on your duty. You are an adult now you do not need my protection and guidence. I love you as if you really were my blood daughter but the truth is that you not. I will always hold you in my heart as my daughter but biologically you are the Daughter of the king and Queen of Pluto you have a duty to the people of Pluto to rule them well and wisely. You are also the chosen of pluto, you guard the flows of time and the outer reaches of this solar system you must not forget that. You cannot shelter under my wings forever it is time for you to step forward and spread your own wings to glide the currants of your own destiney."
"Father" Elisa, Sailor Pluto broke all formal duty as she broke down devestated that the man who had raised her after her parents died would also be leaving. Strangly this strengthened the kings resolve to leave seeing how much she truely depended on him for support. Hugging her tightly he spoke again.
"Elisa i will never truely leave you even if i'm not physically here as long as i'm in you heart i will never be gone."
"Why now?" she sobbed out brokenly
"Because now is when the Vashti offered me the option, and you my dear are ready to step into your role fully as Pluto, i know you don't think you are but trust me when i tell you , you are ready. My great grand daughter is also ready to walk on her own and i trust she will guide Lunaria into a bright future."

Millenia after the conversation on the balcony the Royal could be found on Earth lying on his back underneath a large weeping willow his hand folded behind his head as he took a nap around him "Salazar! Salazar! Of for goodness sakes why can't that boy stay were he's visible"
Salazar, as he was now known frowned slightly and opened his eyes this trip to Earth was supposed to be relaxing so why did he have the misfortune to live next door to an annoying female child.
"Oh i give up point me salazar" Salazar almost laughed when the owner of the voice came through the hanging branches and Salazar eyes slid closed pretending he was asleep "Oh open your eyes Salazar i know you well enough that that act won't fool me."
"Why do you insist on bothering me at the perfect nap times."
"Salazar you think every part of the day is good for naps, now please sit up and talk to me." Grudgingly Salazar did sit up and he looked at the girl across from him.
She was Fourteen Summers old with long brown hair woven into a tight braid, she wore loose blue trousers and a white top. upon her feet were sturdy boots made for heavy use. The only adornment she was was on her forearm which was a leather wand holster. "Alright i'm listening what crazy scheme are you dreaming up this time?"
"Father is looking into marriage prospects" She began "Ah" Salazar groaned "not this again, come on Row you know he's going to keep at you until you agree to at least meet these men"
"No way, Salz they want me to be a housewife or a pureborn lady"
Salazar paused for a moment before replying "Rowena you are a pureborn lady."
"You know what i meant, It's not fair men can go off and adventure but women have to be Ladies, I'm a witch and proud of it"
"So is your mother but you don't see her racing off"
"Mother was born to non-magicals and raised that way. She didn't get her wand till she married father, i don't see why i can't act like other Witches Why i have to be a 'lady'" the last word was said with some disgust.
"If you keep on like that people might get the wrong impression and think you don't like non-magicals"
"I like then fair enough but i don't like what they do to newborns or what there ideas are doing to the magic population"
"There scared of us, it's easy to fear something we don't understand, just look at the relationship between us and luna"
"Thats differant they want to conquor us, we just want to be left alone." Rowena remained mystified as to the reason Salazar burst out laughing at the comment. "And theres not much we can do about the lunarians there so far away but maybe we could do something about the newborns"
"Like?"
"A central school. We get to the wizards and witches born to non magical children early, teach them to be magical not mundane."
"Two people can't run a school and how are we going to find the students?"
"We are genius's thats how surely together we can create spell to find them, Maybe by locating their first bit of accidental magic, and we'll find more people to help us surely we can't be the only people to want to do something like this."
"First things first Row, we need to find if it's feesible, we need a place for the school, the spell to find them and we need a way transport the students. Also we need to convince your Father to stop with the matchmaking and let us go on an adventure to find the place for the school.
Rowena's face fell at the last one and she groaned realising that would be the hardest task.

Many years later Salazar was once again laying under a tree taking a nap around him were children between the ages of eleven and seventeen who he was supposed to be keeping an eye on. "Salazar!" An exasperated voice sighed the Ex-royal cracked on eye open and looked up at the brown haired woman who stood near him, her hand on her hips looking very annoyed "You're supposed to be watching over the students not taking a nap!"
"Naps are a necessary part of life" the Green eyed man said smugly "I can't get through the day without one"
"That's because you're lazy" The woman replied sitting down beside him her eyes scanning over the students.
"I am not Lazy i just like to have my quiet time, and the only time i get that is when i'm watching over the students"
"Laaazyy" The woman sing-songed to which the former king pouted.
"What brings you out here and in tunic and trou instead of thouse full dresses you like so much" Salazar asked refereing to the fact that the women was dressed in black trousers and a purple tunic.
"Godric isn't here so i can dress how i want" The women retorted and Salazar laughed "That wizard needs to grow up, he's living in a fairytale"
"Well we do live in a castle" Salazar said with a chuckle
"Yes but he's acting like a muggle lord expecting women to dress a certain way, act a certain way, those people are so backwards" The witch complained and Salazar laughed "Helga is just as bad you know, she's always going on about being a Proper lady, I am a Lady i just prefere not to trap myself in layers of cloth I thought i'd left all that behind with my Mother."
"I know i've heard her go on at you and even some of the students, and Godric keeps going on about me getting a wife so i can carry on my family line. If i took a wife he'd probably sneak into our rooms on the wedding night to try to tell me how to Love her" That made the witch laugh then wrinkle her nose at the imagery "We just have to ignore them Rowena, sooner or later they'll come to their senses"
"I swear they were probably dropped on their heads as children, what possessed us to get them to act as our partners to build the school"
"Because they are strong magically and come from good backgrounds with a talent for teaching."
"Maybe we should drop hints about them building their own school"
"No, Hogwarts is just going to have to be big enough for all of us"
"Professor Slytherin professor Ravenclaw" a student shouted running at full pelt towards them "Queen Beryl sent an attack on the Moon kingdom"
"What?" Salazar shouted rising to his feet looking far more awake then he did previously "The news has just arrived" The boy said stopping infront of the two adults "Queen serenity is dead, the moon kingdom had fallen none of the senshi survived the other planets are inhospitable and everyones dead, and Queen Beryl has been sealed!"
Salazar stood his face filled with shock.
"They are gone" he whispered "Professor?" the student asked at the same time Rowena called his name "The people of Earth will be happy" He spat out harshly.
"Salazar? what on Earth has gotten into you, the lunarians aren't liked here of course we'll be glad their gone their monachy was always trying to take over here"
"So you would condone a whole race being wiped out of existance? More than one race the other planets are inhospitable that means the martians, the mercurians, the venusian are all gone." Salazar snapped.
"What's done is done and cannot be undone isn't that what you said?"
"It should never have been done in the first place, the Lunarians royals never wanted to rule Earth. There was only one Lunarian Royal King Tranquility the Third that wanted to rule Earth the rest just wanted an alliance for us to live in peace"
"How? How do you know this Salazar?" The witch asked warily.
"Rowena i i'm sorry i should have told you and now my homeland is gone, my people are dead" tears trickled down Salazars face.
"You're lunarian" Rowena breathed in shock "Are you really sir?" the students who had gathered around them asked and Salazar nodded "Yes i am Lunarian, born on the moon, I came to Earth because i wanted to do something with my life and couldn't on Luna."
"Why?" a curious student asked "I was the son of a lord, i was expected to just take over as an advisor to the queen live a quiet life, a boring life, i didn't want it i wanted adventure. I was 15 when i left, when i was a child i studied magic and found i had quiet a gift for it so i learnt as much as i could and when i found out i was part of a very small number of Lunarians who could use Earth magic i decided that Earth was where i would go to find adventure" Salazar said spinning his tale "so i came and found Terran mages to study under until i became a master my self and during that time i became friends with Rowena who convinced me to help build this school"
"Godric and Helga will not accept this" Rowena said saddly "they follow the belief that all lunarians are evil."
"Professor Slytherin isn't Evil" One of the students argued "I know dear but Godric is set in his belief that all Lunarians are evil and Helga will follow his lead on this matter."
"we'll keep it secret we won't tell anyone, right?" the student who spoke turned to look at the others who nodded "We all like you professor no offense meant professor Ravenclaw but Professor Griffindor and Professor Hufflepuff can be a bit stuck up, they won't accept anything that's outside their own beliefs" The two adult exchanged looks and sighed.
"Will you be alright professor?" a female student asked quietly.
"I will be the Lunarians will live on through me and my decendants the blood will slowly dilute but it will always be there in some way Luna will survive" He said resolutly and with that he stood and headed back inside the castle leaving the students and professor to wonder if he really was going to be alright.

For the next few weeks he worked like a man possessed anywhere he went he was seen either with his nose buried in a book or he was writing in a book he wasn't even taking his normal naps which had everybody worried, even Godric and Helga, on top of that he vanished for days with no one knowing where he went off to.

During that summer when the students had gone home and the professors all went to visit their families Salazar remained at the castle alone and on the night of the full moon he shed his Terran persona and became King Tranquility once again the mark on his forehead, a silver cresant moon inside a golden star, shining brightly to the world. His clothes were silver and in the form of loose trousers and a tight shirt, with mid calf length white boots he had his hands cupped infront of him and resting on his palms was a crystal shining iridescently. "Time to go to work Sovereign, this castle and grounds must be protected"

With that said Tranquilitys power flared and he worked his magic through sovereign making the wards stronger making the castle itself stronger and infusing it with magical power bringing it to life, slowly a beautiful kitten came into existance her fur was sleek and shiny and she had green eyes that seemed to have an internal fire then she glowed and grew into a human form of a young child, her hair was exactly like her fur had been, a dark black sleek and shiny and she was wearing a green dress.

"Hello father" the young girl said as she curtsied
"Hello daughter" Salazar greeted letting his power melt back behind his shields.
"What are my orders King tranquility" she asked seriously
"You are to protect the students and the knowledge kept in this castle"
"I will my king" The girl said bowing
"Your form will age until you are an adult and then stop, your cat form has the ability to change but your human form does not, also you do not have to stay in solid form, those forms will always be accessable to you. My last order is for you to pick a name"
"A Name?"
"Yes, a name" Salazar nodded and the girl frowned in concentration thinking deeply.
"Selena, Selena Lunaris Tranquillium" She finally answered and Salazar nodded

For the next few years Selena and Salazar worked together to find and protect any knowledge of the Silver millenium he had even gone back up to the Moon and collected anything he could find which was actually a very large amount since many of the vaults were hidden deep underground. Some things were hidden on the Moon but most were brought back to Hogwarts and Selena took control of keeping them hidden. Hogwarts became a place of secrets, secrets only she and Salazar knew.

Unfortuantly it all came to a head when Godric found Salazar using Moon magic something he would recognise anywhere, Godric accused Salazar of being an evil soul stealing Lunarian wanting to corrupt the terrans students. Salazar denied the claims but pressure from Godric had everyone rallying around and then the governing body of England got involved and they called for the death of the last Lunarian.

The students tried to call for an appeal against the order but they were ignored and Salazar was imprisoned in a high tower for three full days, during those days he talked to Selena and worked a spell with Sovereign which would activate upon his death, On the fourth day Salazar was dragged out into the courtyard and beheaded as he died the spell activated and deep in the heart of Hogwarts a green crystal began to pulse like the beating of a heart, at first the pulse was fast but it soon slowed to a beat every three minutes.

Sat in the corner of the crystal heart room curled into a ball was a young woman who was crying for the loss of her father and in another part of the castle a witch grieved for her dead friend, in fact all across the castle people grieved for the loss of a good wizard. But sadly the victors write the history books and so the legend that Salazar Slytherin was evil was born.

The Spell that Salazar cast had three parts the first would create a power crystal which would keep Selena alive and with power the crystal was linked with his soul so that the crystal would pulse as long as his soul still existed, the second part of the spell would keep his soul, memories and power safe until he could be reborn, and the third part would transform the memories of the Lunarians and the Silver millenium into stories and myths, the magical people would remember but it was something they wanted to forget and with the 'last' Lunarian gone they would quiet happily forget on their own.

Meanwhile at the Gate of time and space Sailor Pluto was watching the gates in confusion as the people of Earth forgot about the silver millenium and the magic they all used to know about and nothing she tried would tell her why, or how.

TBC Read and Review pretty please with cherrys and sugar on top.

Authors note - Wow, you know i hadn't actually checked on the stats for this story in a long time - i have been working on it as you can see from this chapter with all the changes made but i hadn't realised how many people had it on their watch list, favourites or C2's.
Then with getting the reviews over the past few days has definatly kicked my behind into actually posting the chapters that i've edited. So to all who've reviewed, favourite'ed, C2'd Thank You.