Maxima Caesariensis (Latin for "The Caesarian province of Maximus"), also known as Britannia Maxima, was one of the provinces of the Diocese of "the Britains" created during the Diocletian Reforms at the end of the 3rd century.[1] It was probably created after the defeat of the usurper Allectus by Constantius Chlorus in AD 296 and was mentioned in the c. 312 Verona List of the Roman provinces. Its position and capital remain uncertain, although it was probably adjacent to Flavia Caesariensis. On the basis of its governor's eventual consular rank, it is now usually considered to have consisted of Augusta or Londinium (London) and southeastern England.