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Sergius was a monk in Caesarea, Cappadocia. He may have been a priest; records are unclear. He was one of a group of Christians assembled and ordered to make a sacrifice to idols during the persecutions of Diocletian; when the sacrificial fire went out, Sergius immediately claimed it was the work of the true God. He was immediately “tried” and executed by order of the local governor.
Sergius became a martyr.
Died
c.306 in Caesarea, Cappadocia
relics translated to Úbeda, Spain
Canonized
Pre-Congregation
Source: https://catholicsaints.info/saint-sergius-of-caesarea/