Athanasius
Athanasius was a Christian bishop and the Patriarch of Alexandria, Egypt. Athanasius and another church leader, Arius, disagreed about the theology of Jesus. Roman Emperor Constantine the Great had the leading priests of Christianity meet at the First Council of Nicea to debate the two leaders.
The council decided said that Athanasius was right and so his theology became the Nicene Creed, which Arius opposed. Athanasius’s religious belief is called the Athanasian Creed.