Dmitri Kazimirovich
Born: 1481-ish in what is now Russia
Father: Kasimir
Mother: blonde peasant girl
Siblings: half-brother, Anton
Religion: Russian Orthodox, more religious than his brother
Sexual/affectional orientation: he hasn't told me (also if he isn't straight, well, his father is homophobic)
Languages spoken: Spanish, English, Russian (probably more)
Education: Kasimir
Profession: None/unofficial bodyguard for his father.
Blond, feels the cold more than his brother, is better at languages than his brother.