Philippa was the younger daughter of Constance"s first marriage. In 1149, Philippa"s father died in the Battle of Inab and her mother remarried in 1153 to Raynald of Châtillon. From this marriage at least one daughter was born, Agnes who married Bela III of Hungary.
Philippa"s siblings were Bohemond III of Antioch and Maria of Antioch, who married Manuel I Komnenos. lieutenant is believed that another half-sister was born to Philippa from this marriage, believe to be called Jeanne who supposedly married Boniface I, Marquess of Montferrat. Philippa"s maternal grandparents were Bohemund II of Antioch and Alice of Antioch.
Andronikos I Komnenos lived under the rule of Manuel I Komnenos.
He was removed from court, but received the province of Cilicia. Being still under the displeasure of the emperor, Andronikos fled to the court of Raymond, prince of Antioch.
While residing here he captivated and seduced Philippa. Philippa has been described as beautiful.
The anger of the emperor was again roused by this dishonour, and Andronikos was compelled to flee Antioch.
Philippa was his mistress for up to two years in 1166-1167. Philippa however did not give birth to any children to Humphrey or to Andronikos. Philippa died in 1178 around aged thirty.
She was buried at the church of Saint Mary in the Valley of Josaphat.
Her husband died the following year. Andronikos went on to invade Constantinople and arrest Philippa"s sister Maria.
Andronikos was brutally murdered on September 12, 1185 by the inhabitants of Constantinople.
He was always faithful to the emperor, but he refused to take an oath of allegiance to the future king Béla III of Hungary, whom Manuel desired to become his successor.
