The son of Constantius, Felix was a Roman by birth. He was elected to the papacy shortly after the death of St. Dionysius. It was Felix who received the letter from the Asiatic bishops announcing the deposition of Bishop Paul of Antioch, Dionysius having died before its arrival. Felix was also informed of the election of Domnus I to replace the deposed heretic. Unfortunately, Paul refused to vacate the church building and denied entrance to the newly appointed Domnus. Emperor Aurelian, who then sat on the throne, happened to be passing through Antioch when he was asked to intervene in the matter. Aurelian ordered the see to be turned over to whichever bishop was in true communication with the bishops of Italy and Rome. At long last, Paul was forced to make an undignified exit, while Timaeus, Domnus' successor, was able to take his rightful place among his flock.

Felix is said to have ordained that the celebration of Mass take place over the graves of martyrs. Although Felix reigned for nearly six years, little else is know of his pontificate, except that it was free from persecution. Felix died in December and was buried in the papal crypt located in the cemetery of Calixtus. His feast is kept on May 30.

http://www.catholicculture.org/culture/liturgicalyear/calendar/day.cfm?date=2014-05-30