Construction began on the northern side of the forum under the emperor Maxentius in 308 AD, and was completed in 312 by Constantine I after his defeat of Maxentius at the Battle of the Milvian Bridge.
The building project started on the northern side of the forum during the rule of Emperor Maxentius in 308 AD. It concluded two years later, in 312, under Constantine I following his victory over Maxentius at the Battle of the Milvian Bridge.