 Where he did not overwrite Maxentius ' achievements , Constantine upstaged them : the Circus Maximus was redeveloped so that its total seating capacity was twenty @-@ five times larger than that of Maxentius ' racing complex on the Via Appia . Maxentius ' strongest supporters in the military were neutralized when the Praetorian Guard and Imperial Horse Guard ( equites <unk> ) were disbanded . Their tombstones were ground up and put to use in a basilica on the Via <unk> . On November 9 , 312 AD , barely two weeks after Constantine captured the city , the former base of the Imperial Horse Guard was chosen for redevelopment into the Lateran Basilica . The Legio II <unk> was removed from Alba ( Albano Laziale ) , and the remainder of Maxentius ' armies were sent to do frontier duty on the Rhine . 
