Maximiānus, M. Aurelius Valerius in Harpers Dictionary

A Roman emperor, who ruled A.D. 286-305, originally a Pannonian soldier. He was made by Diocletian his colleague in the Empire, but was compelled to abdicate along with the latter. (See Diocletianus.) When his son Maxentius assumed the imperial title in the following year (306 A.D.), he resided some time at Rome; but being expelled from the city by Maxentius, he took refuge in Gaul with Constantine, who had married his daughter Fausta. Here he was compelled by Constantine, against whom he is said to have conspired, to put an end to his own life in 310.

Read More about Maximiānus, M. Aurelius Valerius in Harpers Dictionary