YASCONCELLOS, Andres de (vas-cone-thayl'-los), Portuguese navigator, born in Yelves about the end of the 15th century; died in Portugal in the first half of the 16th century. He was an expert mariner, and sailed in 1538 in the expedition of Hernando de Soto as captain of the "Buena Fortuna." After the landing of Soto at Tampa, Vasconcellos explored the coast as far as the bay of Appalachee, where he landed the rest of his stores, and when Soto went into winter-quarters in 1539, Vasconcellos sailed around the coast of Florida, taking astronomical observations, and landing often to explore the country. On his return to Appalachee, he found the adelantado gone, sailed for Cuba, and thence for Europe, where he wrote an account of his voyage, with accurate details about the formation of the coast and astronomical observations on the position and distance of many points, giving also an interesting description of the fruits, birds, and quadrupeds of the country. His work "Relacao da viagem do almirante Dom Hernando de Soto, descripcao da provincia da Florida" is preserved in the original manuscript in the library of the Duke de Sesa. An anonymous translation was published in French under the title "Histoire de la Floride par le sieur Andre de Vasconcellos" (Paris, 1685), and there is a Spanish translation entitled" Historia de la Florida del Hidalgo de Yelves " (Seville, 1545).