Gaudemunda of Lithuania
Gaudemunda Sophia of Lithuania was the daughter of Traidenis, Grand Duke of Lithuania. In 1279 she married Duke of Masovia Bolesław II of the Piast dynasty. He was the son of Ziemowit I, Prince of Masovia, and Pereyaslava, daughter of Daniel of Galicia of the Rurik dynasty.
Her husband united the Duchy of Masovia and then divided it between their sons, who were:
