Philip instead married Catherine de la Tour du Pin.

The brothers' plan was to marry off their sister to the Emperor in order to create an alliance with him.

Catherine was finally married aged twenty-one in 1316 to Charles, Duke of Calabria.

The couple were married for seven childless years before Catherine died in Naples on 18 January 1323.

After Catherine's death, Charles remarried to Marie of Valois, who became mother of Joanna I of Naples.