Saint Philip was one of the twelve apostles originally selected by Jesus. He is mentioned several times in the Gospels and in the Acts of the Apostles. He was an eyewitness to Christ’s ministry on earth.

It is believed after Christ’s resurrection that he went on to teach in Greece, Syria and Phrygia.

Later stories about saint Philip’s life can be found in the anonymous Acts of Philip. In the Appendix it suggests he died a martyr.
Another legend suggests he was martyred by beheading in the city of Hierapolis.

Sources used wikipedia and The Chuch’s year by Charles Alexander