Jaramillo, Juan, a Spanish soldier and narrator, was with Coronado in the expedition to Quivira in 1540-42. Some years later he wrote an account of the expedition, the original Spanish manuscript of which is in the Buckingham Smith "Coleccion." It has been translated into French by Ternaux-Compans, and into English by George P. Winship, assistant in American history in Harvard University. In this account Jaramillo says that when the Indian guide, Isopete, saw the Arkansas river he recognized it as the southern boundary of Quivira. Some of the historians of the Coronado expedition refer to him as "Captain" Jaramillo, and he was evidently a man of some prominence and influence at that period. (See Coronado.)