Trojden I (1284/1286 – 13 March 1341) was a Polish prince, Duke of Czersk from 1310, ruler over Warsaw and Liw from 1313, and regent of Płock in the years 1336–1340. He was a member of the House of Piast.
Trojden was the second son of Bolesław II of Płock and his first wife Gaudemunda of Lithuania, the daughter of Grand Duke Traidenis of Lithuania. He was named after his maternal grandfather.
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Life
In 1310, Trojden I received the district region of Czersk when his father was still alive. Following his father's death in 1313, he further received the districts of Warsaw and Liw in addition to his duchy, which made him ruler over all of eastern Masovia. This division didn't satisfy all members of his family and led to a brief war between the three brothers (Trojden, Siemowit II and Wenceslaus) in 1316. The exact details of this conflict are unknown except for a brief mention in an annually published manuscript called the Rocznik miechowski.
Initially, Trojden I maintained excellent relations with Polish king Ladislaus the Short (also known as the "Elbow-high"). Thanks to the king's intervention, Trojden I was able to marry Maria, the daughter of Yuri I, King of Halych-Volhynia, in around 1309/1310. Thanks to this union, Trojden's children could legitimately claim the Kingdom of Ruthenia. In 1323, when the Rurikid dynasty in Ruthenia became extinct after the death of Andrew of Galicia, Trojden I was able to place on the throne his oldest son Bolesław, who assumed the name Yuri II (in honour of his maternal grandfather).
In 1325, Trojden I and Siemowit I sent a letter to the Pope outlining the eastern border of their possession as reaching two miles from Grodno (Oppidi quod dictur Grodno, ... a terrarum nostrorum ad duas lencas posit).
