Pedro Jerónimo was present at the 1540 muster for the Expedition as a horseman and listed as Pero Gerónimo. Immediately upon returning to Mexico City, Pedro submitted a méritos y servicios document in which he described some of the events he personally took part in. Because there appears to be this single individual in the documentary record, it may be safe to assume that he is one and the same mentioned in a document regarding Puebla, along with another expeditionary, Lope Caballero.
1540-1550:
1540, Feb: Muster in Flint & Flint, Documents, Document 12 [1 horse, lance, Pero Gerónimo on muster]
AGI, Patronato, 56, N.3, R.2 [November 21, 1542, méritos y servicios de Pedro Jerónimo, tierra nueva] [estante in México; yo fue a la tierra nueva, tres años] [Vázquez de Coronado left “con trezientos E tantos hombres de caballo E de pie”] [Jerónimo took two horses and armas de Castilla y de la tierra] [he suffered much trouble “cargando e descargando dos caballos,” which were carrying “asi de Ropa como de comydas lo compre de mys propios dineros”] [he himself traveled on foot] [podria Valer todo lo que lleVe a la dicha conquysta mas Cantidad de quatro Çientos pesos de oro de mynas] [Jerónimo participated in “las mas de las entradas”] [loaned a horse to don pedro de tovar teniente de general to go to “culoacan (Culiacán) por heRaje”, which returned in weak and bad shape; value 300 pesos de mynas] [witnesses Antonio de Mesa, Domingo Romero, Damián Sánchez, Pedro Pascual, Pedro López de Urrea, Hernando Botello] [Jerónimo “se hallo en la conquysta del Tizón” and “se hallo en la conquysta de Señora”] [Jerónimo “es persona yngenio y habil en la guerra”]
?López de Villaseñor, Cartilla Vieja [p. 283-301: “Lista de los vecinos que recibieron para poblar la ciudad a quienes se les mercedaron solares, huertas, suertes y caballerías tierras, según sus calidades….”-pp. 287-88: Libro 4: 1544, includes: Lope Caballero and Pedro Jerónimo]