Princess Mary of England was born on 18 February 1516 to Henry VIII of England and Catherine of Aragon. She was the younger sister to Henry IX. With her birth her father saw her as an opportunity to renew an alliance with France (Louis XII was his former brother-in-law), therefore in 1523 it was decided that she would marry the heir to the throne, Prince Francis of France. She was raised in France and was married to Francis in 1534, soon they had their first son who became Louis XIII. Not long after the family happiness was crushed as tuberculosis killed the king, their brother-in-law and his wife. They adopted their niece Margaret and she was raised as Louis's sister.