On This Day in Ancient History:
On this date in A.D. 306, Constantius Chlorus (Constantius I) died at York -- where he'd gone to fight the Picts, but died of natural causes.
Public Domain picture courtesy of Wikipedia.
with his son beside him. His son was Flavius Valerius Constantinus, who was to be known as Constantine the Great. Constantine did not automatically become emperor upon the death of his father, although his troops hailed him as such. He had to fight another contender at the Milvian Bridge, which is the site of Constantine's famous vision that led to his conversion to Christianity.
Constantine presided over the First Council of Nicaea in the spring of 325. The dates and people in attendance are subject to dispute. It may have begun May 20 and ended July 25. July 25, 325 is the date on which Constantine celebrated his 19th anniversary on the throne while in attendance at the Council of Nicaea. The Nicene Creed was a product of this convention of church members, but it wasn't finished until 381 in Constantinople.