Diego Luis de San Vitores, SJ was a Spanish Jesuit missionary who founded the first Catholic church on the island of Guam. He is responsible for establishing the Christian presence in the Mariana Islands. He is a controversial figure in some circles due to his role in the Spanish–Chamorro Wars.

Guam is an organized, unincorporated territory of the United States in the Micronesia subregion of the western Pacific Ocean. Guam's capital is Hagåtña, and the most populous village is Dededo. It is the westernmost point and territory of the United States, reckoned from the geographic center of the U.S. In Oceania, Guam is the largest and southernmost of the Mariana Islands and the largest island in Micronesia.