_Henry III WELF _______________+ | (1129 - 1195) _William WELF ________| | (1184 - 1213) | | |_Matilda of PLANTAGENET _______+ | (1155 - 1189) _Otto I WELF ________| | (1204 - 1252) m 1228| | | _Valdemar I Knudsen ESTRIDSEN _+ | | | (1130 - 1182) | |_Helena of ESTRIDSEN _| | (1180 - 1233) | | |_Sofia of POLOVTS _____________+ | (1138 - 1198) | |--Agnes of WELF | | _Otto I ASCANIA _______________+ | | (1128 - 1184) | _Albert II ASCANIA ___| | | (1177 - 1219) m 1205 | | | |_Ada of HOLLAND _______________+ | | (1163 - 1205) |_Matilda of ASCANIA _| (1210 - 1261) m 1228| | _Conrad II WETTIN _____________+ | | (1159 - 1210) |_Matilda of WETTIN ___| (1185 - 1225) m 1205 | |_Elizabeth of PIAST ___________+ (1152 - 1209)