Licinius I married Flavia Julia Constantia, daughter of the "augustus" Constantius Chlorus and half-sister of the "augustus" Constantine I. They wed at Mediolanum (Milan) in February 313. Three years later, Constantine attacked Licinius in the Cibalensean War. Constantine defeated Licinius at the Battle of Cibalae at Cibalae (Vinkovci) in Pannonia Secunda on the 8 October 316 and again at the Battle of Mardia near Hadrianopolis in Haemimontus (Edirne).