Philip became guardian of Robert of Anjou's granddaughter at his death, Queen Joan I of Naples.

He was named titular Latin patriarch of Jerusalem on 18 August 1361 and remained as administrator of the see of Cavaillon until 23 September 1366.

Philip created a cardinal priest of Santi Marcellino e Pietro al Laterano in the ecclesiastical council of 22 September 1368.

He opted for the order of cardinal bishops and the suburbicarian see of Sabina on 31 May 1370 and also participated in the conclave of the same year to elect Pope Gregory XI.

Living just a short twenty-minute walk from one another, they developed a very close relationship that lasted a lifetime.

[11] Petrarch made a collection of 350 letters he personally wrote called Epistolae familiares (a.k.a.

Oh may Christ the Lord not deny me this, that after my death I may no longer be separated from him who was so dear to me in this mortal life!

[16]Pope Gregory XI sent Philippe to Perugia and designated him papal legate and governor of Umbria in early 1372.

[17] Before his term ended he died on 27 August 1372 and was buried in the Carthusian monastery of Bonpas, near Avignon.