▁Jim é nez ▁de ▁los ▁R íos , ▁belonging ▁to ▁noble ▁families ▁of ▁Mur cia . ▁▁ ▁He ▁did ▁his ▁studies ▁in ▁Spain ▁and ▁arrived ▁at ▁the ▁Río ▁de ▁la ▁Pl ata ▁as ▁a ▁passenger ▁of ▁Capt . ▁Francisco ▁de ▁Ret ama ▁in ▁ 1 6 9 1 . ▁Inst alled ▁in ▁Buenos ▁Aires ▁he ▁held ▁various ▁military ▁and ▁political ▁positions , ▁including ▁as ▁commander ▁of ▁the ▁city ▁fort , ▁and ▁not ary ▁in ▁the ▁Real ▁As iento ▁de ▁Ingl aterra . ▁He ▁also ▁held ▁the ▁position ▁of ▁May ord omo ▁of ▁Buenos ▁Aires ▁in ▁ 1 7 0 5 ▁and ▁ 1 7 4 0 , ▁being ▁in ▁charge ▁of ▁man aging ▁the ▁fin ances ▁of ▁the ▁city . ▁ ▁His ▁first ▁public ▁position ▁in ▁the ▁Spanish ▁domains ▁of ▁America ▁was ▁as ▁Governor ▁of ▁Por co ▁( P otos í , ▁Boliv ia ), ▁appointed ▁on ▁September ▁ 1 5 , ▁ 1 7 0 8 , ▁during ▁the ▁vic ero yal ty ▁of ▁Manuel ▁de ▁O ms , ▁ 1 st ▁Mar quis ▁of ▁Cast el ld os ri us . ▁ ▁Family ▁ ▁Miguel ▁Antonio ▁de ▁Mer los ▁was ▁married ▁in ▁the ▁Buenos ▁Aires ▁C athedral ▁to ▁Rosa ▁Mart ine z ▁de ▁Fig u ero a , ▁born ▁in ▁ 1 6 6 9 ▁in ▁Chile , ▁daughter ▁of ▁Juan ▁Martínez ▁Gu err ero , ▁a ▁Cre ole ▁no blem an ▁of ▁Chile an ▁origin , ▁and ▁Jose fa ▁de ▁Fig u ero a ▁y ▁Cab rera , ▁born ▁in