Who married Euphemia of Masovia?

Vladislaus II of Opole (Polish: Władysław Opolczyk, German: Wladislaus von Oppeln, Hungarian: Oppelni László, Ukrainian: Владислав Опольський; ca. 1332 – 18 May 1401), nicknamed Naderspan, was Duke of Opole from 1356, Count palatine of Hungary (1367–1372), Duke of Wieluń (1370–1392), Governor of Ruthenia (1372–1378), Count palatine of Poland (1378) as well as Duke of Dobrzyń, Inowrocław (1378–1392), Krnov and Kuyavia (1385–1392).

Vladislaus was the eldest son of Duke Bolko II of Opole by his wife Elisabeth, daughter of Duke Bernard of Świdnica.