Pedro Nieto, a native of Plasencia (Cáceres province), was the son of Antón Nieto and María Hernández. He obtained a license to travel to Peru in 1537, as did three other expeditionaries, Juan Navarro, Serrano, and Santillana. Pedro was present at the 1540 muster as a member of Luna y Arellano's company. He was living in Mexico City at least into the 1560s.
AGI, Pasajeros, L.2, E.3445 = Boyd-Bowman, Indice geobiográfico, II:3052 [February 5, 1537 [Pedro Nieto, hijo de Antón Nieto y de María Hernández, vecinos de Plasencia, to Peru? (Bartolomé Serrano, E.3443, Francisco de Santillana, E.3447, Juan Navarro, E.3448]
1540, Feb: Muster in Flint & Flint, Documents, Document 12 [3 horses, [chainmail] vest, native arms, Luna y Arellano's company]
?Actas de Cabildo, Tomo III, Book 6, p.147 [31 August 1554-Pedro Nieto, vecino, granted a solar in the barrio of San Hipolito abutting the house of Francisco Gutiérrez and Villalobos and por delante the calle que pasa por casa de Juan de Moscose, el mazero in the calle de Ballersteros];
AGI, Patronato, 63, R.5 [witness for Juan Gómez de Paradinas, June 1560] [vecino, ciudad de México] [40+ years old] [has known Paradinas about 25 yrs in Nueva España] [gave information that the expedition covered more than 3,000 leagues and that many Spaniards died] [Nieto could sign his name (no signature on copy)]