 In late 306 , Maximian took the title of Augustus again and aided his son Maxentius ' rebellion in Italy . In April 307 , he attempted to depose his son , but failed and fled to the court of Constantius ' successor , Constantine ( who was both Maximian 's step @-@ grandson and also his son @-@ in @-@ law ) , in Trier . At the Council of Carnuntum in November 308 , Diocletian and his successor , Galerius , forced Maximian to renounce his imperial claim again . In early 310 , Maximian attempted to seize Constantine 's title while the emperor was on campaign on the Rhine . Few supported him , and he was captured by Constantine in Marseille . Maximian committed suicide in the summer of 310 on Constantine 's orders . During Constantine 's war with Maxentius , Maximian 's image was purged from all public places . However , after Constantine ousted and killed Maxentius , Maximian 's image was rehabilitated , and he was deified . 
