The council was summoned by Constantine in order to establish the Christian creed in the context of numerous theological disputes such as Arianism. It was later ranked as the First Ecumenical Council.
Bouchard, Elsa. "Council of Nicaea". The Literary Encyclopedia. First published 01 March 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=11541, accessed 21 September 2014.]