Stamboom Riny Doyle geboren Marinus van Waard » Siemowit III OF MASOVIA (± 1320-1381)

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± 1320-1381


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Er ist verheiratet mit Euphemia OF OPAWA.

im Jahr 1335.


  1. Siemowit IV OF MASOVIA  ± 1354-1426 

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Siemowit III of Masovia (his name also rendered Ziemowit; c. 1320 - 1381) was a prince of Masovia and a co-regent (with his brother Casimir I of Warsaw) of the lands of Warsaw, Czersk, Rawa, Gostynin and other parts of Masovia.

Siemowit was the second son of Trojden I of Masovia and his wife Maria, daughter of Yuri I of Galicia.

In 1341, following the death of their father and brother, Siemowit and his younger brother Casimir inherited the Duchy of Czersk. In 1345 following the death of their uncle Siemowit II of Rawa, they also inherited the Duchy of Rawa. In 1349 the two brothers shared their possessions. Siemowit gave the small region of Warsaw to his brother Casimir, retaining the regions of Czersk, Liw and Rawa.

Early in his reign, Siemowit tried to establish good neighborly relations with his powerful neighbors: the Teutonic Order, Poland and Bohemia. Some historians believe that Siemowit rendered a tribute of vassalage to Charles IV, Holy Roman Emperor in 1346. Other historians say this happened in 1351, in order to inherit from Boleslaw III of Plock who was a vassal of Bohemia.

But on September 18 1351, Siemowit and Casimir recognised the Polish King Casimir III the Great as suzerain, canceling the allegiance of Masovia and Bohemia. In exchange, they got Gostynin (Siemowit) and Sochaczew (Casimir), former possessions of Boleslaw III. Casimir also gave the Duchy of Plock to the brothers.

When his brother Casimir died unexpectedly in 1355, Casimir III the Great left the Duchy of Warsaw to Siemowit. In exchange, he promised never to ally with enemies of Poland and the Duchy of Plock would return to Poland, unless Casimir III died without an heir. In addition, Casimir III offered Siemowit a small territory of Lesser Poland bounded by the river Pilica and Radomka.

From that time, relations between Siemowit and Casimir III the Great become increasingly narrow. In 1363, Siemowit was invited to Krakow for the marriage of Elizabeth of Pomerania, granddaughter of the king of Poland, with the Emperor Charles IV. In September 1364 he participated in a conference in Krakow, which offered five crowned kings, dukes and princes extravagant festivities and tournaments. In 1369 Margaret, the daughter of Siemowit, wife of Casimir IV, Duke of Pomerania, adopted an illegitimate son of Casimir III the Great. At that time, Casimir IV of Slupsk was one of the contenders to succeed Casimir III the Great, who left only daughters.

When Casimir III the Great died in 1370, under agreements concluded with one of his lifetime friends Siemowit III, he freed Siemowit from Polish suzerainty and gave Plock, Wizna, Wyszogród and Zakroczym back to Mazovia. Having a reunified Masovia, it regained its independence, there Siemowit III promulgates a customary law in 1377. He reformed the administration, justice and the monetary system.

In 1373/1374 he gave the regions of Warsaw and Rawa to his sons, Siemowit IV of Masovia and Janusz I of Warsaw.

Marriages and Issue
In 1335, Siemowit married Euphemia, daughter of Nicholas II of Opawa. They had the following children:
Euphemia (-21 June 1418/9 December 1424), married Wladyslaw Opolczyk
Anna (before 1345-after 16 Mar 1403), nun at Ratibor
Janusz I of Warsaw (-8 Dec 1429), succeeded in 1374 as Janusz I, Prince of Ciechanów and Warsaw
Margaret (before 1358-14 May 1388/4 April 1396), married firstly to Casimir IV, Duke of Pomerania and secondly to Henryk VIII with a Scar
Siemowit IV of Masovia (b. ca. 1353/1356- d. January 21, 1426), succeeded his father as Duke of Masovia.

Siemowit remarried, after Euphemia's death to Anna, daughter of Nicolas of Ziebice. From this marriage he had three children:
unnamed son, died young
unnamed son, died young
Henry of Masovia (1368/1370-1392/1393), became Bishop of Plock

Siemowit accused Anna of adultery when she became pregnant with Henry. After his birth Siemowit had Anna strangled and Henry cast away. However, it turned out Henry was the son of Siemowit so he was made a bishop.

After working his whole life on reuniting Masovia and making it an indipendent state, Siemowit III died on June 16 1381 and was buried at Plock Cathedral.

Source: Wikipedia

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