Andrés de Urdaneta was a maritime explorer for the Spanish Empire of Basque heritage, who became an Augustinian friar. At the age of seventeen, he formed part of the Loaísa expedition to the Spice Islands where he spent more than eight years. Around 1540 he settled in New Spain and became an Augustinian friar in 1552. At the request of Philip II he joined the Legazpi expedition for a return to the Philippines. In 1565, Urdaneta discovered and plotted an easterly route across the Pacific Ocean, from the Philippines to Acapulco in the Viceroyalty of New Spain. The route made it practical for Spain to colonize the Philippines and was used as the Manila galleon trade route for more than two hundred years.

New Spain, officially the Viceroyalty of New Spain, originally the Kingdom of New Spain, was an integral territorial entity of the Spanish Empire, established by Habsburg Spain. It was one of several domains established during the Spanish conquest of the Americas, and had its capital in Mexico City. Its jurisdiction comprised a large area of the southern and western portions of North America, mainly what is now Mexico and the Southwestern United States, but also California, Florida and Louisiana; Central America, the Caribbean, and northern parts of South America; several Pacific archipelagos, most notably the Philippines and Guam. Additional Asian colonies included "Spanish Formosa", on the island now known as Taiwan.