 Discovered by the Spanish expedition of Ferdinand Magellan in 1521, the island has a long history of European colonialism beginning in the 16th century, and especially in 1668 with the arrival of Spanish settlers including Padre San Vitores, a Catholic missionary.Guam and the rest of the Mariana Islands were integrated in the Spanish East Indies since 1565.The island was a major stopover for Manila Galleons sailing from Acapulco, until 1815.