谁嫁给了Euphemia of Masovia？

Euphemia of Masovia (Polish: Eufemia mazowiecka; 1395/97 – before 17 September 1447), was Duchess of Cieszyn by marriage to Bolesław I, Duke of Cieszyn, and regent of the Duchy of Cieszyn during the minority of her sons from 1431.

She was the third daughter of Siemowit IV, Duke of Masovia and Alexandra, daughter of Algirdas, Grand Duke of Lithuania and sister of King Władysław II Jagiełło of Poland, and thus a Polish princess member of the House of Piast in the Masovian branch.

Bolesław I of Cieszyn (Polish: Bolesław I cieszyński, Czech: Boleslav I. Těšínský, German: Boleslaus I. von Teschen) (c. 1363 – 6 May 1431) was a Duke of half of Bytom and Siewierz from 1405, Duke of Cieszyn and half of both Głogów and Ścinawa from 1410, and Duke of Toszek and Strzelin during 1410–1414.

He was the second son of Przemysław I Noszak, Duke of Cieszyn by his wife Elisabeth, daughter of Bolesław, Duke of Koźle-Bytom. In the chronicle of Jan Długosz he is named the eldest son, but this is certainly a mistake, because elsewhere, Przemysław of Oświęcim was always placed before Bolesław.