A merchant ship captain from Getaria (Spanish Guetaria), Elcano violated Spanish law by surrendering a ship of his to Genoan bankers in repayment of a debt. Seeking a pardon from the Spanish King Charles V, he signed on, as a low level officer, to Ferdinand Magellan's expedition to circumnavigate the globe. Elcano was made captain of Conception, one of five vessels. Spared from execution by Magellan after taking part in a failed mutiny, Elcano went on to take command of the fleet when Magellan was killed in the Philippines, on April 27, 1521.
On September 6, 1522, Elcano sailed into Sanlúcar de Barrameda, Spain, aboard the Victoria, along with 17 other Europeans survivors of the 265 man expedition, and 4 Indians aboard. The profits of the spices they carried made them rich though. The king conceded him a coat of arms picturing a globe with the motto: Primus circumdedisti mihi (in Latin, "You went around me the first"). In fact, it was an East Asian native who was a servant of Magellan, that became the first man to circumnavigate the world when the fleet arrived to his home country.
In 1525 Elcano was appointed to the command of a fleet of 7 ships and sent to claim the Indonesian islands Moluccas for Spanish king Charles V. Elcano died of malnutrition somewhere in the Pacific Ocean while attempting a second circumnavigation of the planet.
The differences resolved violently, Elcano was able to return with the previous charge to the ship Concepcion, at whose hand he would cross the anxiously looked for Estrecho (later said by Magellen) in November of that year and penetrated the immense waters of the Pacific ocean.
Juan Sebastian de Elcano was later recieved by the emperor Carlos V, who, among other things that he gave to the crew of the surviving ship, he granted to the native of Geutaria a pension of 500 ducados and the coat of arms with the legend: "primus circumdedisti me".
We later see Elcano in Valladolid, where, as fruit of a romance he had with Maria de Vidaurreta, a daughter was born to him.