¿Quién se casó con Casimir I of Opole?

Casimir I of Opole (Polish: Kazimierz I opolski; c. 1178/79 – 13 May 1230), a member of the Piast dynasty, was a Silesian duke of Opole and Racibórz from 1211 until his death.

Viola, Duchess of Opole, also known as Veleslava (Bulgarian: Венцислава), Polish: Wencisława-Wiola; (died 7 September 1251) was a Duchess consort of Opole-Racibórz through her marriage to Casimir I. She served as regent during the minority of her sons Mieszko II and Władysław between 1230 and 1233.