Trojden I of Masovia
| Trojden I, Duke of Masovia | |
|---|---|
 |
|
| Spouse(s) |
Maria of Galicia m. 1309/10 - wid. 1341 |
| Noble family | House of Piast |
| Father | Bolesław II of Płock |
| Mother | Gaudemantė (Sophia) of Lithuania |
| Born | 1284/86 |
| Died | 13 March 1341 |
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.
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).
In 1325 Trojden I and Siemowit I send a letter to the Pope determined the eastern border of their possession as reaching two miles from Grodno (Oppidi quod dictur Grodno, ... a terrarum nostrorum ad duas lencas posit).
The aggressive policy pursued by Władysław I the Elbow-high (who wanted to reunite all the territories of Poland and Masovia) were a threat for Trojden I and his brothers, especially when Władysław I attacked and plundered Płock as a punishment for the alliance of the youngest Masovian Duke, Wenceslaus with the Teutonic Order. This event caused that on 2 January 1326 at Brodnica, Trojden I and his brothers concluded an agreement with the Teutonic Order, which led to a short conflict with Poland and its ally Lithuania.
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