 The first ensign used by the Christian Church was the labarum of the Roman Emperor Saint Constantine I.In the year 312, on the eve of the Battle of the Milvian Bridge, he saw a vision of the Cross of Christ appear in the sky, and beneath it the words "Ἐν τούτῳ νίκα" ("En touto nika", "In this, be victorious").Constantine ordered the symbol of the Cross to be placed on the imperial standards.