Boleslas Ier de Mazovie

Boleslas Ier de Mazovie (in Polish Bolesław I Mazowiecki ), from the dynasty of the Piasts, was born in 1208 and deceased at spring 1248. He is the oldest son of Conrad Ier de Mazovie.

He was duke of Sandomierz (he reigned on part of the duchy) of 1229 with 1232. In 1233, it became the Duc north of the Mazovie and in 1247, it inherited all the duchy of Mazovie.

Since its more young age, it belongs to the ambitious political projects of his father. Already in 1227, after the assassination of Lech the White, it accompanies his/her father in Petite Poland to take part in the negotiations on its succession. Ladislas III with the Legs Hails thwarts the plans of Mazovie to seize the throne and becomes duke of Cracow. In spite of this failure, Conrad offers to his/her son thestrong one of Dobrzyń nad Wisłą. In 1229, Conrad seizes part of the duchy of Sandomierz, with the town of Radom, which it offers to Boleslas in exchange of Dobrzyń nad Wisłą that it gives to Siemovit, another of its sons. In 1231, Boleslas takes part with his/her father and his brothers in the installation of the Teutoniques in the area of Chełmno, on low the the Vistula. At the same time, Boleslas supports his/her father in the war carried out by this one to conquer the throne of Cracow following the death of Ladislas III with the Legs Hails. In 1232, a rapid counter-offensive of Henri Ier Bearded the and a surprised invasion of Mazovie by the Prussian oblige Conrad to give up Cracow. Moreover, Henri Ier the Bearded one takes again the control of the entirety of the duchy of Sandomierz.

To compensate for the loss of the duchy of Sandomierz, Conrad offers to Boleslas part of Mazovie, with Sieradz like capital. Nevertheless, Conrad keeps the control of the foreign politics and the army. In 1234, Boleslas obtains the north of Mazovie in exchange of the area of Sieradz, close to the Petite Poland, and strategically important for his/her father who always aims at becoming duke of Cracow. In the years which follow, Boleslas attacks its Prussian neighbors and Russian. It installs the Ordre of Dobrin to Drohiczyn. In 1238, it takes share with the war against Daniel de Galicie and Mendog of Lithuania.

In 1241, after the death of Henri II the Piles with the Battle of Legnica, it militarily supports his/her father who seizes Cracow. It will be driven out by it two years later.

The death of Conrad Ier de Mazovie the August 31st 1247 opens new horizons with Boleslas. By will, it receives most of Mazovie. It must face the aggression of his brother Casimir, not satisfied with its heritage, and which after having driven out his/her brother Siemovit de Sieradz and Łęczyca, seizes place-strong Dobrzyń nad Wisłą.

Boleslas dies a little later in spring 1248. By will, it bequeathed all its possessions to his younger Siemovit brother.

See too

State teutonic

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