Basil of Ancyra was a 4th-century Christian bishop, priest, and physician living in Galatia. He is primarily recognized for his theological defense of the Nicene Creed, specifically opposing Arianism and pagan beliefs. During the reign of Julian the Apostate, he faced significant persecution for his faith. Following his arrest and torture, he was executed in Ancyra around 362 or 363. His historical record is preserved largely through a single work detailing his life and martyrdom.