A debt-ridden adventurer stowed away from Hispaniola in 1510 and three years later became the first European to see the Pacific from Panama. Balboa's rivalry with the governor Pedrarias Dávila ended with his beheading in 1519. His 'South Sea' showed the Americas were a separate continent, though he was also a conquistador who massacred Indigenous people.
The sighting date is given as September 25 or 27, 1513, and the barrel-stowaway story is the traditional account. The chroniclers Oviedo and Anghiera had their own agendas, and the death tolls at Quarequá come from them. Indigenous voices reach us only through Spanish accounts.