Pedro Antonio de Cevallos
Pedro Antonio de Cevallos Cortés y Calderón , also spelled Ceballos ( 29 June 1715 – 26 December 1778 ) , was a Spanish military Governor of Buenos Aires between 1757 and 1766 , and the first Viceroy of the Río de la Plata in 1776 . 
<triplet> Pedro Antonio de Cevallos <subj> 29 June 1715 <obj> date of birth <subj> 26 December 1778 <obj> date of death <triplet> Governor of Buenos Aires <subj> Viceroy of the Río de la Plata <obj> located in the administrative territorial entity