Arius
Arius (born around 260, died 336 in Constantinople) was an early Christian thinker. He lived in Alexandria, but was probably born in Libya. He did not agree with his bishop Alexander who said that Jesus and God were the same. Arius said Jesus and God were not the same since there was a time when Jesus did not exist.
At the First Council of Nicea, most bishops did not vote with Arius; the official document says that God the Father and Jesus the Son were of the same essence, and therefore the same being. They voted that Jesus and God had existed together for all time.
Arius Media
Greek icon of Arius getting slapped by Nicholas of Myra
Constantine I burning Arian books, illustration from a book of canon law, c. 825
The Arian Baptistery erected by Ostrogothic king Theodoric the Great in Ravenna, Italy, around 500
Ceiling mosaic of the Arian Baptistry, in Ravenna, Italy, depicting the Father, Son, and Holy Ghost present, with John the Baptist