312


 * This article is about the year 312. For other uses, see .

Roman Empire

 * — : defeats  and becomes the only  in the West. During the battle, he reportedly has a vision of a cross with the words  ("In this sign you shall conquer").
 * Construction begins on the in Rome.

Religion

 * The supports, which espouses a rigorous application and interpretation of the sacraments. These doctrines will be condemned by the  in.
 * Constantine promotes a policy of state sponsorship of, perhaps even becoming a Christian himself (see ).

Deaths

 * —, Roman Emperor (slain in battle)