He was the son of Count Otakar V in the Chiemgau (died 1020) and his wife, a daughter of Count Arnold II of
Wels-
Lambach who had been appointed
margrave upon the deposition of Duke
Adalbero of Carinthia by Emperor
Conrad II in 1035. He married Willibirg of
Eppenstein, possibly a daughter of Duke
Adalbero of Carinthia. The later margraves
Adalbero and
Ottokar II were his sons. The elder Adalbero succeeded his father but fell out with his younger brother Ottokar II during the Investiture Controversy, was banned and finally murdered in 1082. Ottokar is documented as a count in the eastern Chiemgau about 1048. By his mother he inherited extended
allodial lands and the
margravial title in the
Traungau region around the fortress of
Steyr. He also served a
Vogt (reeve) of the
Lambach,
Traunkirchen,
Obermünster, and
Persenbeug monasteries and was co-founder of
Admont Abbey. From 1056, he appeared as margrave of the
Carantanian march, later to be known as the
March of Styria (, after the town of Steyr, where Ottokar was
count). In the rising
Investiture Controversy he remained a loyal supporter of King
Henry IV. Ottokar died in
Rome, while on a pilgrimage to the
Holy Land. ==Sources==