Mieszko I Tanglefoot brother Vladimir, Duke of Olomouc, son of Otto III Detleb. They had five children: Mieszko I Tanglefoot Mieszko IV Tanglefoot () (ca. 1130 – 16 May 1211) was Duke of Kraków and High Duke of Poland from 1202 and from 9 June 1210 until his death. He was also Duke of Silesia from 1163 to 1173 (with his brother as co-ruler), Duke of Racibórz from 1173 and Duke of Opole (as Mieszko I Tanglefoot). He was the second son of Władysław II the Exile by his wife Agnes of Babenberg, daughter of Margrave Leopold III of Austria and half-sister of
Mieszko I of Poland situation at that time. Another debatable point is Thietmar's claim that Mieszko "subordinated himself to the King". Most historians believe that it was only a matter of recognition of Otto's royal authority. Some suggest that a fealty relationship could in fact be involved. Whether or not the German-Polish invasion of Bohemia actually happened, the friendly relations between the Czechs and the Poles came to an end. Bohemia resumed its earlier alliance with the Lutici, which caused in 990 a war with Mieszko, who was supported by Empress Theophanu. Duke Boleslav II was probably the first one to attack. As a