Euphrosyne of Masovia also known as ''Eufrozja'' (1292–1328/1329) was Duchess of

Oświęcim Oświęcim (; german: Auschwitz ; yi, אָשפּיצין, Oshpitzin) is a city in the Lesser Poland ( pl, Małopolska) province of southern Poland, situated southeast of Katowice, near the confluence of the Vistula (''Wisła'') and Soła rive ...

by her marriage. Euphrosyne was the daughter of Boleslaus II of Masovia, Prince of Plock and his second wife

Kunigunde Kunigunde, Kunigunda, or Cunigunde, is a European female name of German origin derived from "kuni" (clan, family) and "gund" (war). In Polish this is sometimes Kunegunda or Kinga. People with such names include: * Kunigunde of Rapperswil (c. early ...

, daughter of

Ottokar II of Bohemia Ottokar II ( cs, Přemysl Otakar II.; , in Městec Králové, Bohemia – 26 August 1278, in Dürnkrut, Lower Austria), the Iron and Golden King, was a member of the Přemyslid dynasty who reigned as King of Bohemia from 1253 until his dea ...

. The genesis of her name is unknown. This is the first and the last time that princess of Masovian lineage of Piast was named Eufrozyna. Modern Polish historians usually named her ''Eufrozyna'', but in sources she was mentioned mostly as ''Eufrazja''. Her younger brother was Prince

Wenceslaus of Płock Wenceslaus (Wańko) of Płock ( pl, Wacław Płocki, Masovian dialect: ''Wańko Puocky''; 1293/97 – 23 May 1336), was a Polish prince member of the House of Piast, Duke of Płock from 1313 and vassal of Bohemia from 1329. He was the third son ...

(ca. 1295-1336). According to older historians Euphrosyne had also sister Berta, but she was a midget from Euphrosyne's mother court. Eufrozyna had also siblings from previous father's marriage. They were Siemowit II, Trojden I and wife of Władysław Prince of Leginca (her name is unknown). The date of birth of Euphrosyne is unknown. Her parents married in 1291, so she could be born not earlier than in 1292. According to genealogist

Oswald Balzer Oswald Marian Balzer (23 January 1858 in Chodorów – 11 January 1933 in Lwów) was a Polish historian of law and statehood, one of the most renowned Polish historians of his times. In 1887 he became a professor at the University of Lwów. Be ...

Euphrosyne was born in 1292. This theory was based on fact that she must be at least 14 years old, when she get married in 1306 (her son Jan I was born in 1307). The exact date of Euphrosyne's marriage to

Władysław of Oświęcim Władysław of Oświęcim ( pl, Władysław oświęcimski; 1275/80 – by 15 May 1324), was a Duke of Oświęcim from 1315 until his death. He was the eldest son of Mieszko I, Duke of Cieszyn by his wife, probably called Grzymisława. Life In 129 ...

is unknown. Genealogists assume that the marriage was concluded between 1304–1309, indicating the year 1306. The couple were already connected by a marriage. Euphrosyne's cousin

Wenceslaus III of Bohemia Wenceslaus III ( cz, Václav III., hu, Vencel, pl, Wacław, hr, Vjenceslav, sk, Václav; 6 October 12894 August 1306) was King of Hungary and Croatia between 1301 and 1305, and King of Bohemia and Poland from 1305. He was the son of Wencesla ...

was married to Władysław's sister

Viola Elisabeth of Cieszyn Viola of Teschen, later known as Viola Elizabeth ( pl, Wiola Elżbieta cieszyńska, cs, Viola Alžběta Těšínská) (ca. 1291 – 21 September 1317), was Queen of Bohemia and Poland by marriage to Wenceslaus III of Bohemia. She was daughter o ...

. Euphrosyne's husband died between 15 December 1321 and 15 May 1324. She participated in the regency of her son John, who was now ruler of the duchy of Oświęcim. She participated in the government until at least 14 November 1328. It was the last time that she was mentioned in documents. According to ''Nekrolog dominikanów krakowskich'' she died on 26 December. The year of her death is disputed. She may died shortly after 1327, may be yet in 1328. Euphrosyne was buried in the Dominican monastery in Krakow. Euphrosyne and Władysław had two or three children: #

Jan I the Scholastic Jan I the Scholastic ( pl, Jan I Scholastyk; 1308/10 – 1372 before 29 September), was a Duke of Oświęcim from 1324 until his death. He was the eldest child and only son of Duke Władysław of Oświęcim by his wife Euphrosyne, daughter of Duk ...

(b. 1308/10 - d. by 29 September 1372). #Anna (d. 19 September 1354), married Tamás Szécsényi (Tomasz Szechenyi), obergespan of Arad, Bács and Szerém. #probably also a daughter, a nun in Dominican monastery in Racibórz.

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* * {{authority control 1292 births 14th-century women rulers Piast dynasty 1320s deaths Polish princesses 13th-century Polish people 13th-century Polish women 14th-century Polish people 14th-century Polish women