Kurš apprecējās ar Bolesław IV the Curly?

Bolesław IV the Curly (Polish: Bolesław Kędzierzawy; c. 1122 – 5 January 1173), a member of the Piast dynasty, was Duke of Masovia from 1138 and High Duke of Poland from 1146 until his death in 1173.

Maria (c. 1140 – after 1173) was by marriage High Duchess of Poland.

By the majority of historians and web sources, her parentage is unknown; however, others authors believed that she was a daughter of Rostislav I Mstislavich, Grand Prince of Kiev.

Viacheslava of Novgorod (Russian: Вячеслава новгородская, Polish: Wierzchosława Nowogrodzka; c. 1125 – 15 March by 1162?), was a Kievan Rus' princess member of the Monomakhovichi and by marriage Duchess of Masovia and Kuyavia and High Duchess of Poland since 1146.

She was the daughter of St. Vsevolod, Prince of Novgorod and Pskov by his wife, a daughter of Svyatoslav Davidovich, Prince of Chernigov.