These would feature the Czech king Wenceslaus I of Bohemia and the conflict between him and his son Ottokar II of Bohemia .
Head entity: ottokar ii of bohemia Q150320 18 19 20 21
Tail entity: wenceslaus i of bohemia Q175833 6 7 8 9
Relation (head \u2192 tail): P22
Inverse relation (tail \u2192 head): P40