Who was Gregory Thaumaturgus, and how did he study under Origen?

St. Gregory Thaumaturgus (c. 213–c. 270) was a Greek Christian and bishop of Neocaesarea, known as a "wonder worker" for the miracles he reputedly performed to help spread Christianity. He was a champion of orthodoxy during the 3rd-century Trinitarian controversy and is remembered for his pastoral work and his writings, including the Exposition of Faith and a Canonical Epistle.12

Gregory was originally a law student who was introduced to Christianity through his studies with Origen at Caesarea. After Origen was ordained as a presbyter and settled in Caesarea, he attracted many students, among whom Gregory was one of the most notable. Gregory documented his experience as a student in his Panegyric to Origen, which provides a detailed and graphic description of Origen’s specific methods of instruction.132