Euphrosyne of Masovia also known as Eufrozja (1292 – 1328/1329) was Duchess of Auschwitz by her marriage.

Euphrosyne was the daughter of Boleslaus II of Masovia

Boleslaus II of Masovia

Boleslaw II of Masovia or Boleslaw II of Płock was a ruler of Masovia. He was the younger brother Konrad II of Masovia and son of Siemowit I of Masovia. His mother was Pereyaslava , daughter of Daniel of Galicia....

, Prince of Plock

Plock

Płock is a city in central Poland, on the Vistula river. According to the data provided by GUS on 30 June 2009 there were 126,675 inhabitants. It is located in the Masovian Voivodeship , having previously been the capital of the Płock Voivodeship . It now is a capital of a Powiat at the extreme...

 and his second wife Kunigunde

Kunigunde of Bohemia

- References :...

, daughter of Ottokar II of Bohemia

Ottokar II of Bohemia

Ottokar II , called The Iron and Golden King, was the King of Bohemia from 1253 until 1278. He was the Duke of Austria , Styria , Carinthia and Carniola also....

. Genealogist Oswald Balzer determined that it was most likely that Euphrosyne was born in1292. Her brother was Prince Wenceslaus of Płock (ca.1293-1336), grandfather of Hedwig of Sagan

Hedwig of Sagan

Hedwig of Sagan was a daughter of Henry V of Iron and his wife Anna, daughter of Duke Wenceslaus of Płock. She is also known as Jadwiga. She was the fourth wife of Casimir III the Great and wife of Rupert I of Legnica...

, wife of Casimir III of Poland

Casimir III of Poland

Casimir III the Great , last King of Poland from the Piast dynasty , was the son of King Władysław I the Elbow-high and Hedwig of Kalisz.-Biography:...

.

The exact date of Euphrosyne's marriage to Władysław of Oświęcim

Władysław of Oświęcim

Władysław of Oświęcim , 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:...

 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 of Bohemia

Wenceslaus III Premyslid was the King of Hungary , King of Bohemia and the king of Poland ....

 was married to Władysław's sister Viola Elisabeth of Cieszyn

Viola Elisabeth of Cieszyn

Viola Elisabeth of Cieszyn was a Polish princess member of the House of Piast in the Cieszyn branch and by marriage Queen of Bohemia and Poland....

. This marriage would bring more connections between the

Euphrosyne's husband died between December 15 1321 and May 15 1324. She participated in the regency of her son John, who was now ruler of the duchy of Auschwitz. She participated in the government until at least November 14 1328, when she may have died. Euphrosyne's was last mentioned on November 14 1328, the date of her death is known from the tombstone in the Dominican monastery in Krakow

Kraków

Kraków also Krakow, or Cracow , is the second largest and one of the oldest cities in Poland. Situated on the Vistula River in the Lesser Poland region, the city dates back to the 7th century. Kraków has traditionally been one of the leading centres of Polish academic, cultural, and artistic life...

, where Euphrosyne still lies today. However the year of her death is disputed. The date was December 26. She probably died im 1328 or 1329.

Euphrosyne and Władysław had two children:

1. Jan I the Scholastic
   Jan I the Scholastic
   Jan I the Scholastic , 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 Duke Boleslaus II of Masovia.-Life:...
   
    (b. 1308/10 - d. by 29 September 1372).
2. Anna (d. 19 September 1354), married Tamás Szécsényi, obergespan of Arad, Bács and Szerém.

Ancestry