What European first saw the pacific oceanin 1513?

The first European to see the Pacific Ocean in 1513 was Vasco Núñez de Balboa, a Spanish explorer who led an expedition across the Isthmus of Panama. He reached the shores of the ocean on September 25, 1513, and claimed it for Spain. The ocean was initially called the "South Sea" by Balboa, but it was later renamed the "Pacific Ocean" by Portuguese explorer Ferdinand Magellan in 1521.