Pedro de Sosa was born circa 1748, the son of Domingo Cristobal de Sosa and Maria de la Ascencion.
In 1803 he purchased Camargo 40 from Juan Bautista Villarreal for 40 pesos. Juan Bautista Villarreal sold his porcion to two sons and two sons-in-law of the neighboring grantee, Domingo Cristobal de Sosa (41). (Camargo protocolos p. 320)