20 May, 325
On this day in 325 Roman Emperor Constantine I (known as The Great to history) convened the first ecumenical council of the Christian Church in the city of Nicaea. Constantine of course was the first Roman Emperor to convert to Christianity. After more than three centuries of spread and development, the church had become fractured by varying interpretations and ideas, and the council was an attempt to settle issues that were dividing the faithful. The council also served to cement the emperor’s authority, and settled many matters including when Easter was to be celebrated.