▁he ▁held ▁various ▁posts ▁in ▁the ▁government . ▁In ▁ 1 8 0 2 ▁he ▁accompanied ▁Hor ace ▁S éb ast iani ▁de ▁La ▁Port a ▁on ▁his ▁Eastern ▁mission , ▁and ▁in ▁ 1 8 0 4 ▁he ▁was ▁present ▁in ▁the ▁Ott oman ▁Empire , ▁assist ing ▁S éb ast iani ▁in ▁Ist an bul . ▁ ▁In ▁ 1 8 0 5 , ▁he ▁was ▁dispatch ed ▁to ▁Q aj ar ▁Pers ia ▁in ▁the ▁" J a ub ert ▁Mission ", ▁to ▁ar range ▁an ▁al liance ▁with ▁Shah ▁F at ′ h ▁Ali , ▁but ▁on ▁the ▁way ▁there ▁he ▁was ▁seized ▁and ▁imprison ed ▁in ▁a ▁dry ▁c is tern ▁for ▁four ▁months ▁by ▁the ▁P asha ▁of ▁Do ğ ub ey az ı t . ▁Ja ub ert ▁was ▁allowed ▁to ▁go ▁after ▁the ▁p asha ▁died ; ▁he ▁successfully ▁accomplished ▁his ▁mission , ▁and ▁rejo ined ▁Napoleon ▁in ▁the ▁Duch y ▁of ▁Wars aw ▁( 1 8 0 7 ). ▁Am éd ée ▁Ja ub ert ▁was ▁at ▁Fin cken stein ▁Palace ▁for ▁the ▁neg ot iation ▁of ▁the ▁Tre aty ▁of ▁Fin cken stein ▁which ▁form ul ised ▁the ▁Franco - Pers ian ▁al liance ▁on ▁ 2 7 ▁April ▁ 1 8 0 7 . ▁In ▁ 1 8 0 9 ▁he ▁became ▁correspond ent ▁of ▁the ▁Royal ▁Institute ▁of ▁the ▁Netherlands . ▁ ▁On ▁the ▁e ve ▁of ▁Napoleon ' s ▁down fall , ▁he ▁was ▁appointed ▁charg é ▁d ' aff