Gaudemunda Sophia, Princess of Lithuania (also Gaudimantė; ca. 1260 – 1288/1313) was a daughter of Traidenis

Traidenis

Traidenis was the Grand Duke Lithuania from 1270 till 1282. He is the second most prominent, after Mindaugas, Grand Duke of Lithuania in the 13th century. His reign ended a seven-year unrest period after Mindaugas was assassinated in 1263 and firmly established the Grand Duchy as a pagan state...

, Grand Duke of Lithuania (ca. 1270–1282). In 1279 she married Duke of Masovia Boleslaw II (ca. 1254-1313) of the Piast dynasty

Piast dynasty

The Piast dynasty was the first historical ruling dynasty of Poland. It began with the semi-legendary Piast Kołodziej . The first historical ruler was Duke Mieszko I . The Piasts' royal rule in Poland ended in 1370 with the death of king Casimir the Great...

. He was the son of Ziemowit I, Prince of Masovia, and Pereyaslava, daughter of Daniel of Galicia of the Rurik Dynasty

Rurik Dynasty

The Rurik dynasty or Rurikids was a dynasty founded by the Varangian prince Rurik, who established himself in Novgorod around the year 862 AD...

.

Her husband united the Duchy of Masovia

Duchy of Masovia

The Duchy of Masovia with its capital at Płock was a medieval duchy formed when the Polish Kingdom of the Piasts fragmented in 1138. It was located in the historic Masovian region of northeastern Poland...

 and then divided it between their sons, who were:

• Siemowit II
  Siemowit II of Masovia
  Siemowit II of Masovia was Duke of Masovia from 1310 to 1345. He was a member of the House of Piast. Siemowit was Duke of Warsaw and Liw . In 1313, he became the ruler of Duchy of Rawa...
  
  
  • Received the Duchy of Rawa
• Trojden I (named after Gaudemunda's father, Traidenis, ca. 1285 – 13 March 1341)
  • Received the Duchy of Czersk and Warsaw
  • Married his cousin Maria, daughter of George I of Halych
    George I of Halych
    Yuri I of Galicia was prince of Belz and King of Galicia-Volhynia or King of Rus' ....
    
    
  • Great-grandfather of Cymburgis of Masovia
    Cymburgis of Masovia
    Cymburgis of Masovia in January 1412 became the second wife of the Habsburg Duke Ernest the Iron of Austria and thus a Duchess/Archduchess of the Inner Austrian line in Styria, Carinthia and Carniola.Cimburgis was born at Warsaw in the Duchy of Masovia to Duke...
    
    
• Wacław I
  • Received the Duchy of Płock