Pope during Constantine's reign and the Council of Nicaea, which defined key Christian doctrines. Nationality: http://www.wikidata.org/.well-known/genid/5e0632af56974efb2542c9296b8a4643 Born: January 1, 0300 Died: January 1, 0336 Pontificate: February 1, 0314 – January 1, 0336