He is married to Elena Rostislavna [Rurikide] of Kiev Smolensk.
They got married about 1163.
Child(ren):
euweb.dir/piast1.html#B1
G8. [2m.] Kazimierz II "Sprawiedliwy" "the Just", Pr of Sandomir and Cracow 1177, Pr of Kujawia and Mazowia 1186, Ct of Poland (1177-94), *1138, +5.5.1194; 1m: ca 1163 Helena of Znaim(+1202/06); 2m: 1185/86 Yelena , dau.of Great Pr of Kiev; for his issue see HERE
http://en.wikipedia.org/wiki/Casimir_II_the_Just