Siemovit III of Mazovie

Siemovit III of Mazovie (in Polish Siemowit III Mazowiecki or Ziemowit III Mazowiecki ) (v. 1313 - June 16th 1381), of the dynasty of Piasts, is duke of Mazovie.

Siemovit III is the second wire of the duke of Mazovie Trojden I {{er}} and of Marie, the girl of Georges I {{er}} of Galicie-Volhynie.

In 1341, with died of their father, Siemovit and its brother Casimir inherit the duchy of Czersk. In 1345, following the death of their uncle Siemovit II of Rawa, they also receive duchy of Rawa. In 1349, the two brothers share their possessions. Siemowit leaves the small area of Warsaw in Casimir, preserving the areas of Czersk, Liw and Rawa.

At the beginning of its reign, Siemovit endeavors to establish relations between good neighborhood and its powerful neighbors who lorgnent on his duchy: the Teutoniques, the Poland and the Bohemia. Certain historians think that Siemovit III and Casimir Ier returned a Hommage of Vassal ité to the emperor Charles IV of Luxembourg towards 1346. For other historians, they would have paid a homage of vassalage to the emperor only in 1351, to be able to inherit Boleslas III of Płock which was vassal of Bohemia.

But the September 18th 1351, Siemovit III and Casimir recognize Casimir III Large the like Suzerain, thus cancelling the allegiance of Mazovie in Bohemia. In exchange, they obtain Gostynin (Siemovit) and Sochaczew (Casimir), old possessions of Boleslas III. Casimir also gives the duchy of Płock in pleasure to the two brothers.

When Casimir Ier dies suddenly in 1355, Casimir III the Large one leaves the duchy of Warsaw with Siemovit III. In exchange, this one promises never to be combined with enemies of Poland and to return the duchy of Płock to Poland, except if Casimir III dies without heir. Moreover, Casimir III offers to Siemovit a small territory of Small-Poland limited by the rivers Pilica and Radomka.

As from this moment, the relations between Siemovit and Casimir III the Large one become increasingly close. Thus, in 1363, Siemovit is invited to Cracow with the marriage of Élizabeth of Poméranie, the niece of king de Pologne, with the emperor Charles IV. In September 1364, it takes part in the congress of Cracow, which offers to five crowned kings and nine dukes and princes an extravagant program of festivities and tournaments. In 1369, Marguerite, the girl of Siemovit, marries Casimir IV of Słupsk, the adoptive son of Casimir III the Large one. At that time, Casimir IV of Słupsk is one of the applicants to the succession of Casimir III the Large one.

When Casimir III the Large one dies in 1370, under the terms of the agreements concluded with this one from alive sound, Siemovit III is freed from Polish suzerainty and the areas of Płock, Wizna, Wyszogród and Zakroczym reinstate the Mazovie. Having reunified Mazovie become again independent, Siemovit III promulgates a Common law there in 1377. It reforms the administration, justice and the monetary system.

In 1373/1374, it gives the areas of Warsaw and Rawa to its sons, Siemovit IV of Płock and Janusz I {{er}} Elder the.

Siemovit III married twice. Of its first marriage with Euphémie, the girl of the duke Nicolas II of Opava, it had two wire (Siemovit and Janusz) and three girls (Anne, Euphémie and Marguerite). Of its second marriage with Ludmila, the girl of the duke Nicolas the Small one of Ziębice, it had a son (Henri de Mazovie|Henri).

After having work all its life with the independence and the reunification of Mazovie, Siemovit III of Mazovie dies the June 16th 1381 and is buried in the cathedral of Płock.

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