Gregory Thaumaturgus was a Christian Bishop of the 3rd century. He was born around AD 213 to a wealthy pagan family in Neocaesarea, Pontus. Originally, he was known as Theodore ("gift of God"). About 233, he and his brother, Athenodorus, accompanied their sister, who was joining her husband in Caesarea, Palestine, while they continued on to Beirut to pursue their law studies. They met Origen and instead of going to Beirut, joined his school at Caesarea, studied theology, were converted to Christianity by Origen, and eventually became his disciples.

Gregory returned to Neocaesarea about 238 and was elected Bishop by the seventeen Christians of the city. He preached eloquently, made so many converts and was able to build a church as well. Soon he was reckoned for his miracles and was surnamed ‘Thaumaturgus’ (meaning, the wonderworker). He was a much-sought-after arbiter for his wisdom and legal knowledge and ability. He advised his flock to go into hiding when Decius' persecution of the Christians broke out in 250 and fled to the desert with his deacon.

On his return, he ministered to his flock when plague struck his See, and also when the Goths devastated Pontus in 252-254. He participated in the synod of Antioch in 264-265, against Samosata, and fought sabellianism and Tritheism.

He is invoked against floods and earthquakes. Once, he reportedly stopped the flooding Lycus, and another time, he is said to have moved a mountain.

According to Gregory of Nyssa, Gregory Thaumaturgus was favoured by an apparition of the Blessed Virgin and John the Apostle, and that the latter dictated to him a creed or formula of Christian faith, of which the autograph existed at Neocaesarea when the biography was being written. The creed itself is important for the history of Christian doctrine.

Other Saints of the Day
1. Saint Elizabeth of Hungary
2. Saint Hugh of Lincoln
3. Saint Alphaeus
4. Saint Dionysius of Alexandria
5. Saint Hilda of Whitby

- catholic.org