Arianism
Arianism as a heresy that arouse in the fourth century, and denied the Divinity of Jesus Christ. Arianism occupies a large place in ecclesiastical history. Arianism is a Christological view originally held by followers of Arius, a Christian priest who lived and taught in Alexandria, Egypt, in the early 4th century. Arius taught that God the Father and the Son were not co-eternal, seeing the pre-incarnate Jesus as a divine being but nonetheless created by (and consequently inferior to) the Father at some point, before which the Son did not exist. In English-language works, it is sometimes said that Arians believe that Jesus is or was a "creature"; in this context, the word is being used in its original sense of "created being".
Sources
http://www.newadvent.org/cathen/01707c.htm