This current year of 2025 marks the 1700th anniversary of the First Council of Nicaea (AD 325), called by Emperor Constantine to address the division brought about by the Arian controversy. This council, one of the so-called Seven Ecumenical Councils (because they were recognized as valid by both the Eastern and Western branches of the church) met in the city of Nicaea in what is today northwestern Turkey near the modern city of Iznik, during the summer months of 325. The earliest centuries of Christendom faced the double challenge of standing firm against persecution and standing just as firm against wrong doctrine. Those years were especially difficult for the church as it needed to clarify a correct articulation of the Trinity, specifically about the relationship between Jesus’ humanity and deity, and then also about the relationships between the three persons of the Holy Trinity.