Casimir of Bytom : definition of Casimir of Bytom and synonyms of Casimir of Bytom (English)

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Casimir of Bytom

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Casimir of Bytom (Polish: Kazimierz bytomski; b. 1253/57 - d. 10 March 1312), was a Duke of Opole during 1282-1284 (with his brother as co-ruler) and Duke of Bytom from 1284 until his death.

He was the second son of Władysław, Duke of Opole-Racibórz, by his wife Euphemia, daughter of Władysław Odonic, Duke of Greater Poland.


Little is known about the first years of Casimir's life. By 1264, he was knighted by King Ottokar II of Bohemia and with this began his politic activities with his father.

After the death of his father in 1282, Casimir inherited the Duchy of Opole with his brother Bolko I as co-rulers. The common rule between them lasted until 1284, when they decided to make a formal division of their domains: Casimir took the towns of Bytom (the main city and now capital of his Duchy), Koźle, Toszek, Gliwice and Siewierz.

There are few reports of Casimir's independent rule. Certainly at the end of the 1280s he and his brothers Mieszko I and Przemysław supported the Bishop of Wrocław, Thomas II Zaremba in his conflict with Henry IV Probus, the powerful Duke of Wrocław -their other brother Bolko I unexpectedly supported Henry IV. The cause of the bad relations between Władysław Opolski's sons and the Duke of Wrocław possibly started when Henry IV repudiated his wife Constance (sister of the Opole-Racibórz brothers) and sent her back home. The reasons for this repudiation are disputed among historians, but it probably was because of the Constance's suspected infertility.

The difficult relations with Henry IV Probus brought a much greater enemy into the Silesian affairs. On 10 January 1289 Casimir was the first Silesian Duke to pay homage to the Bohemian King Wenceslaus II in Prague. The direct arguments which caused Casimir to make this radical step are unclear. In any event, the Dukes of Cieszyn and Racibórz soon followed the example of Casimir and also paid homage to the Bohemian crown (some historians believed that this could be the cause of the bloody Battle of Siewierz on 26 February of that year).

In subsequent years, Casimir remained a faithful ally of King Wenceslaus II in his Polish politics, although the close cooperation with the Bohemian Kingdom didn't directly benefit him (except for his presence during the King's trips to Sieradz in 1292 or at the coronation of Wenceslaus II in Prague in 1297).

In 1303, Casimir decided to give his sons separate districts, which further helped to reduce the already small Duchy of Bytom: Bolesław received Toszek and Władysław obtained Koźle.

The extinction of the Přemyslid dynasty after the death of King Wenceslaus III in 1306 caused the Duke of Bytom to stop his homage to the Bohemian crown. From that moment, Casimir had a significant change in his foreign politics, became more closely associated with the new Duke of Kraków, Władysław I the Elbow-high. The marriage of Casimir's daughter Maria to the Hungarian King Charles Robert in 1306 surely increased the prestige of both Casimir and his Duchy.

In internal politics, Casimir was a strong guardian of the Church, especially with the Order of the Holy Sepulchre installed in Miechów, which received many privileges from him. He also gave the order to build castles of considerable size in Bytom and surrounding towns, thanks to the revenues obtained from the silver mines in Bytom.

Casimir died on 10 March 1312. It's unknown where he was buried but it is possible that the burial could have occurred in the monastery of Czarnowąsy in Opole, which was generously supported by the Duke.

Marriage and Issue

Between 1275-1278, Casimir married Helena (d. by 1323), whose origins are unknown. Given by her name and the choice of her children's names, historians believed that she had a Russian or Lithuanian origin; according to the Genealogist Kazimierz Jasiński, she may have been a daughter of Lev I of Galicia by his wife Constance, daughter of King Béla IV of Hungary. Helena was probably named after Constance's sister Blessed Jolenta Helena of Poland, wife of Bolesław the Pious, one of the Greater Poland Dukes. However, this theory isn't counted important by many. They had six children:

  1. Bolesław (b. 1276/78 - d. 17 January 1329).
  2. Władysław (b. 1277/83 - d. by 8 September 1352).
  3. Maria (b. 1282/84 - d. Temesvár, 15 December 1315), married in 1306 to King Charles I Robert of Hungary.
  4. Siemowit (b. 1292 - d. aft. 1 July 1342).
  5. George (b. 1300 - d. by 1327).
  6. Mieszko (b. ca. 1305 - d. bef. 9 August 1344).

The considerable age difference between Casimir's three older and three younger children created the theory that he maybe had more than one wife. However, there is no evidence that supports this and the majority of historians accept that Helena was his only wife and mother of all his known children.


This article incorporates information from the revision as of 11 May 2009 of the equivalent article on the Polish Wikipedia.
Regnal titles
Preceded by
Duke of Opole
with Bolko I

Succeeded by
Bolko I
Preceded by
new creation
Duke of Bytom
Succeeded by


All translations of Casimir of Bytom

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