# Arian controversy begins (c. 318)

URL: https://christianity-history.com/timeline/318-arian-controversy-begins
Location: Alexandria, Egypt
Themes: Theology

The Alexandrian priest Arius teaches that the Son was created by the Father, sparking the greatest doctrinal crisis of the fourth century. At this point in the timeline (c. 318), the Bishop of Rome was Pope Sylvester I (31 January 314 – 31 December 335).

## Why it matters
Arian controversy begins mattered because it shaped how Christians understand God, Christ, salvation and the church.

Pope at the time: [Pope Sylvester I](https://christianity-history.com/popes/pope-sylvester-i)

## Sources
- [Wikipedia — Arianism](https://en.wikipedia.org/wiki/Arianism)
- [Encyclopaedia Britannica topic lookup — Arian controversy begins](https://www.britannica.com/search?query=Arian+controversy+begins)
- [Wikipedia — Age Of Councils (period overview)](https://en.wikipedia.org/wiki/First_seven_ecumenical_councils)