Trojden I, Duke of Masovia

Trojden I (1284/86– 13 March 1341), was a Polish prince member of the House of Piast, Duke of Czersk since 1310, ruler over Warsaw and Liw since 1313, regent of Płock during 1336–1340.

He was the second son of Bolesław II of Płock and his first wife Gaudemantė (Sophia), the daughter of Grand Duke Traidenis of Lithuania. He was named after his maternal grandfather.

Life

In 1310, when his father was still alive Trojden I received the district of region Czersk. When his father died in 1313, he further received the districts of Warsaw and Liw in addition to his duchy, which made him ruler over all the eastern Masovia. This division didn't satisfy anybody and lead to a brief war between the three brothers in 1316. Apart from a brief mention in the Roczniku miechowskim, the exact details of this conflict are unknown.

Initially Trojden I maintained excellent relations with Władysław I the Elbow-high. Thanks to his intervention, in ca. 1309/10 Trojden I could married Maria, daughter of Yuri I, King of Halych-Volhynia. Thanks to this union, when in 1323 became extinct the royal Rurikid dynasty in Halych-Volhynia, and thanks to the help of Władysław I, Trojden I was able to put into the throne his own oldest son Bolesław, who assumed the name Yuri II (in honour of his maternal grandfather).