Siegfried married Sophie, Princess Of Denmark after 1181 in Schleswig, Schleswig-Holste, Prussia. Sophie, (daughter of Valdemar I "the Knudsen King Of, ENMARK and Sofiya Vladimirovna Pri, [Q OF DEN]VGOROD) was born in 1159 in Of, Roskilde, Roskilde, Denmark; died in 1208. [Group Sheet] [Family Chart]