▁Ca esar , ▁son ▁of ▁T iber ius ▁( not ▁to ▁be ▁confused ▁with ▁N ero ▁Claud ius ▁Dr us us , ▁brother ▁of ▁T iber ius ), ▁accompanied ▁by ▁two ▁Pra et or ian ▁coh ort s , ▁the ▁Pra et or ian ▁Caval ry , ▁and ▁Imperial ▁German ▁Body gu ards . ▁The ▁mut iny ▁in ▁Germania ▁was ▁repr essed ▁by ▁the ▁nep hew ▁and ▁designated ▁he ir ▁of ▁T iber ius , ▁German icus , ▁who ▁later ▁led ▁leg ions ▁and ▁det ach ments ▁of ▁the ▁Guard ▁in ▁a ▁two - year ▁campaign ▁in ▁Germania , ▁and ▁succeeded ▁in ▁recover ing ▁two ▁of ▁the ▁three ▁leg ion ary ▁e ag les ▁which ▁had ▁been ▁lost ▁at ▁the ▁Battle ▁of ▁the ▁Te ut ob urg ▁Forest . ▁ ▁It ▁was ▁under ▁T iber ius ▁that ▁Lu cius ▁A el ius ▁Se ian us ▁( Se jan us ) ▁rose ▁in ▁power ▁and ▁was ▁among ▁the ▁first ▁pre fect s ▁to ▁explo it ▁his ▁position ▁to ▁purs ue ▁his ▁own ▁amb itions . ▁He ▁concentr ated ▁under ▁his ▁command ▁all ▁the ▁Pra et or ian ▁coh ort s ▁in ▁the ▁new ▁camp . ▁Se jan us ▁held ▁the ▁title ▁of ▁pre fect ▁joint ly ▁with ▁his ▁father , ▁under ▁August us , ▁but ▁became ▁sole ▁pre fect ▁in ▁AD ▁ 1 5 . ▁He ▁used ▁that ▁position ▁to ▁render ▁himself ▁essential ▁to ▁the ▁new ▁em peror ▁T iber ius , ▁who ▁was ▁unable ▁to ▁persu ade ▁the ▁Senate ▁to ▁share ▁the ▁responsibility