Inspired by a combination of two plot bunnies/challenges by ReganX: That Catherine is publically fighting at Blackfriars but privately (working with Anne Boleyn) she actually wants out of the marriage and a Harry Potter Tudors 'verse. (Beatriz Galind is a real person - a tutor to both Catherine and her mother. Though she was not actually secretly a witch). Also owes a whole lot to 'Anne Boleyn The Witch Queen' for the general prophecy concept. I've also made Princess Mary a little older to be about Anne's age.
The fact that Catherine has been planning for this day since she was first told she had magic does not ease what she must do. It will help that she esteems and likes Anne, who will be good to Mary. She will have letters yes, but it is not the same as being there, in the country that has come to be home to her.
She was nine years old when she found herself being told she had magic and if it had been anyone but Beatriz who had told her, she would have thought them heretics, tempting her towards sin. Instead she found she could accept that magic is given by God, just as some are given talents in music or law or painting. It is to be used to good ends then it is not an evil thing, she comes to understand. When she is eleven she is given a letter delivered by an eagle that directs her to a convent in Granada that Catherine has never heard tell of.
Saint Maria Luminosa Academia contained some of the happiest years of her life, though it had been hard at first. It was not a great school like those of the Turks or the others in the East but it was a school great in learning. Catherine knows that while she may have wished for Mary to attend Saint Maria, Hogwarts will be wonderful for her and give her a freedom that perhaps, she will never have in the muggle world.
Catherine of Aragon is the daughter of two great Spanish Monarchs. She is also a great seer.
From almost as early as she could remember she had dreamed of a beautiful red haired Queen of England - one who held a wand and a sceptre in her hands and who would bring about a golden world. Later she had Seen more - the children of the red haired queen and their descendants who would make the world much kinder for magical and non magical folk alike. When Mary was born she had seen her as Regent Minister of England, standing by her half sisters side. And the red haired queen would have a brother who would help both her and Mary.
She had also seen what would happen if Queen Elizabeth did not come about and burnings and witch hunts are almost the least of it.
When Queen Catherine of Aragon had caught a glimpse of a young Anne Boleyn, she had known who the second Witch Queen would be. She had not expected to be as drawn to the little girl as she was. But little Anne, barely a toddler, was a draw to Catherine. A second daughter. Thomas Boleyn is a doting father, though there is very little magic about him but it is easy to suggest that Anne should join Mary's household as a lady in waiting when she is a little older. What no one knows is that Anne will be going to Hogwarts.
It is hard (and strange) to think that she will be giving up her husband to a girl who is barely older than Mary but Catherine finds it easier, knowing that she loves Anne.