Ortolf von Ilmmünster was born circa 985 to Rapoto IV. von Inn- und Norital (?-bef1017) and Hemma von Babenberg (?-?) . Notable ancestors include Charlemagne (747-814). Ancestors are from France, Germany, Belgium.
This family is poorly documented. It seems that Ortulf and his sister Wildrut had already taken religious vows when his brother Konrad, who had succeeded their father, died at an early age. Ortulf and Wildrut then turned the ancestral Castle Hohenwart into Monastery Hohenwart, but his niece seem to have inherited property as well.