Ponce de León (disambiguation). Juan Ponce de León[a] (c. 1474 – July 1521[6]) was a Spanish explorer and conquistador known for leading the first official European expedition to Puerto Rico in 1508 and Florida in 1513. He was born in Santervás de Campos, Valladolid, Spain, in 1474. Though little is known about his family, he was of noble birth and served in the Spanish military from a young age. He first came to the Americas as a "gentleman volunteer" with Christopher Columbus's second expedition in 1493.