cus ▁was ▁defeated ▁and ▁killed ▁in ▁ 8 6 . ▁ ▁Anton ine ▁dynast y ▁ ▁Following ▁assass ination ▁of ▁Dom it ian ▁in ▁ 9 6 ▁the ▁Pra et ori ans ▁demanded ▁the ▁execution ▁of ▁their ▁pre fect , ▁Tit us ▁Pet ron ius ▁Sec und us , ▁who ▁had ▁been ▁imp licated ▁in ▁the ▁murder . ▁The ▁Guard ▁supported ▁Tra jan , ▁commander ▁of ▁the ▁Army ▁of ▁the ▁Rh ine , ▁as ▁new ▁em peror . ▁ ▁At ▁the ▁death ▁of ▁N erva , ▁at ▁the ▁beginning ▁of ▁ 9 8 , ▁Tra jan ▁executed ▁the ▁remaining ▁Pra et or ian ▁pre fect ▁and ▁his ▁part is ans . ▁Tra jan ▁returned ▁to ▁Rome ▁from ▁the ▁Rh ine , ▁probably ▁accompanied ▁by ▁the ▁new ▁unit ▁of ▁equ ites ▁singular es ▁August i . ▁The ▁Pra et or ian ▁Guard ▁had ▁participated ▁in ▁the ▁two ▁Da cian ▁Wars ▁of ▁Tra jan ▁( D aci an ▁Wars ▁ 1 0 1 – 1 0 2 ▁and ▁ 1 0 5 – 1 0 6 ). ▁The ▁Pra et or ian ▁Guard ▁served ▁in ▁the ▁last ▁campaign ▁of ▁Tra jan ▁against ▁the ▁Par th ians ▁of ▁ 1 1 3 – 1 1 7 . ▁ ▁During ▁the ▁ 2 nd ▁century , ▁the ▁Pra et or ian ▁Guard ▁accompanied ▁Lu cius ▁Ver us ▁in ▁the ▁Oriental ▁War ▁Camp aign ▁of ▁ 1 6 1 – 1 6 6 ▁AD , ▁as ▁well ▁as ▁accomp any ing ▁Roman ▁em peror ▁Marcus ▁A ure lius