Antonio Pigafetta, an Italian nobleman, documented Ferdinand Magellan's first circumnavigation of the globe in his travelogue, which is a critical primary source for understanding precolonial Philippines. He provides insights into the islands encountered, such as the 'Landrones Islands' (now known as Marianas), and describes the friendly interactions with the native populations. Pigafetta's account also touches on their discoveries, including the first signs of gold on Humunu Island.