▁the ▁em peror ▁A ure li an , ▁they ▁took ▁part ▁in ▁an ▁expedition ▁against ▁Pal my ra . ▁In ▁ 2 8 4 , ▁Dioc let ian ▁reduced ▁the ▁status ▁of ▁the ▁Pra et ori ans ; ▁they ▁were ▁no ▁longer ▁to ▁be ▁part ▁of ▁palace ▁life , ▁as ▁Dioc let ian ▁lived ▁in ▁Nic om edia , ▁some ▁ 6 0 ▁miles ▁( 1 0 0   km ) ▁from ▁By z ant ium ▁in ▁Asia ▁Minor . ▁Two ▁new ▁corps , ▁the ▁I ov iani ▁and ▁Her cul iani ▁( named ▁after ▁the ▁gods ▁J ove , ▁or ▁Jup iter , ▁and ▁Her cules , ▁associated ▁with ▁the ▁senior ▁and ▁junior ▁em peror ), ▁replaced ▁the ▁Pra et ori ans ▁as ▁the ▁personal ▁protect ors ▁of ▁the ▁em per ors , ▁a ▁practice ▁that ▁remained ▁int act ▁with ▁the ▁T etr archy . ▁In ▁ 2 9 7 ▁they ▁were ▁in ▁Africa ▁with ▁Maxim ian . ▁By ▁the ▁time ▁Dioc let ian ▁retired ▁on ▁May ▁ 1 , ▁ 3 0 5 , ▁their ▁Cast ra ▁Pra et oria ▁seems ▁to ▁have ▁hous ed ▁only ▁a ▁minor ▁g arrison ▁of ▁Rome . ▁ ▁D iss ol ution ▁ ▁During ▁the ▁early ▁ 4 th ▁century , ▁Ca esar ▁F la vi us ▁Val er ius ▁Sever us ▁attempted ▁to ▁dis band ▁the ▁Pra et or ian ▁Guard ▁on ▁the ▁orders ▁of ▁Gal er ius . ▁In ▁response , ▁the ▁Pra et ori ans ▁turned ▁to ▁Max ent ius , ▁the