Answer
Hedwig of Cieszyn was the mother of John Zápolya, the King of Hungary from 1526 to 1540. She was a member of the Piast dynasty, a powerful Polish noble family. Hedwig's marriage to John Zápolya's father, Stephen Zápolya, was arranged to strengthen the alliance between Poland and Hungary. She was a strong supporter of her son's claim to the Hungarian throne and played an active role in his reign.