In 1516, he arrived to Florida from Cuba with one vessel and explored the west coast of the peninsula, reaching the Apalachee Bay, named after his trip Miruelo bay. In Florida, he exchanged a few things of glass and steel for gold and silver collected by the Amerindians from the remains of wrecks in Florida.  So, he mapped Pensacola Bay. 
After that, he returned to Cuba. Due to failing to take note in the course of latitudes traveled for him and not remember them, he was unable to show the way to Florida on a second trip and he went insane.
- "The Spanish Presence in Northwest Florida--1513 to 1705" (history), University of West Florida, 2006, webpage: UWF-hist.
- De Leon, Ponce. A Gistory of Florida. Florida Center for Instructional Technology, College of Education, University of South Florida, 2005.
- Toscano, Nicolas. La Florida y el suroeste americano (in Spanish: Florida and the American Southwest). Page 34.
- FLORIDA OF THE CONQUISTADOR.