Who was the first European to discover the Pacific in 1513?

Spanish explorer Balboa was the first European to sight the Pacific from America in 1513 after his expedition crossed the Isthmus of Panama and reached a new ocean. He named it Mar del Sur (literally, "South Sea") because the ocean was to the south of the coast of the isthmus where he first observed the Pacific. Later, Portuguese explorer Ferdinand Magellan called the ocean Pacífico (or "Pacific" meaning, "peaceful") because, after sailing through the stormy seas off Cape Horn, the expedition found calm waters.