The first Catholic mass in the Philippines likely took place on Mazaua Island, now known as Limasawa Island, according to primary accounts from Pigafetta and Albo who were part of Magellan's expedition. The expedition spent seven days on Mazaua Island from March 28th to April 4th 1521, where the first mass was held on Easter Sunday, March 31st. While Butuan has long been believed to be the site of the first mass, analysis of the primary sources indicates key details about Butuan's geography are omitted that make Limasawa a more likely location.