Inge I
Philip was the son of Simon Kåresson (d. 1190) and Margrét Arnadóttir. Símon Kåresson had been a prominent opponent of King Sverre, who fought with the unsuccessful pretender Jon Kuvlung in the 1180s and was killed launching a new unsuccessful rising against Sverre in 1190. Philip was the grandson of Ingrid Ragnvaldsdotter, the dowager queen of Norway. Philip's mother Margrét was the half-sister of King Inge I of Norway and full sister of Nikolás Arnason, bishop of Oslo and another prominent opponent of King Sverre and the Birkebeiner.