▁( who ▁replaced ▁the ▁Imperial ▁German ▁Body guard ▁dis band ed ▁by ▁Gal ba ). ▁ ▁Following ▁the ▁assass ination ▁of ▁em peror ▁Dom it ian , ▁his ▁successor ▁N erva ▁was ▁placed ▁under ▁the ▁protection ▁of ▁Tra jan , ▁to ▁counter ▁possible ▁reven ge ▁attempts ▁and ▁mut in ies . ▁Tra jan ▁was ▁commander ▁of ▁the ▁most ▁important ▁army ▁of ▁the ▁time , ▁that ▁of ▁the ▁Army ▁of ▁Germania , ▁and ▁he ▁nominated ▁him ▁as ▁his ▁he ir . ▁According ly , ▁and ▁following ▁such ▁an ▁act , ▁Tra jan , ▁aim ing ▁to ▁rein force ▁his ▁security ▁detail ▁in ▁relation ▁to ▁the ▁Spe cul ator es ▁who ▁had ▁remained ▁loyal ▁to ▁Dom it ian , ▁replaced ▁them ▁as ▁close ▁protection ▁security ▁detail ▁with ▁the ▁Sing ular es / equ ites ▁singular es ▁August i ▁( model led ▁on ▁the ▁Sing ular es ▁of ▁a ▁provincial ▁governor , ▁a ▁post ▁held ▁by ▁Tra jan ). ▁The ▁some ▁ 3 0 0 ▁Spe cul ator es ▁were ▁re ass igned ▁by ▁Tra jan ▁to ▁the ▁corps ▁of ▁Pra et or ian ▁coh ort s . ▁ ▁They ▁were ▁distinguished ▁by ▁a ▁special ▁( but ▁unknown ) ▁style ▁of ▁bo ots , ▁the ▁Spe cul ator ia ▁Cal iga ▁( acc ording ▁to ▁Su eton ius ) ▁and ▁they ▁received ▁special ▁honor ific ▁diplom as ▁in ▁bronze ▁at ▁dem obil ization . ▁They ▁had ▁their ▁own ▁E quest rian ▁instruct ors ▁( Ex erc it ator es ). ▁ ▁Service ▁in ▁the ▁Pra et