 After the death of Constantius on July 25 , 306 , Constantine assumed the title of Augustus . This displeased Galerius , who instead offered Constantine the title of Caesar , which Constantine accepted . The title of Augustus then went to Severus . Maxentius was jealous of Constantine 's power , and on October 28 , 306 , he persuaded a cohort of imperial guardsmen to declare him as Augustus . Uncomfortable with sole leadership , Maxentius sent a set of imperial robes to Maximian and saluted him as " Augustus for the second time " , offering him theoretic equal rule but less actual power and a lower rank . 
