The significance of the first mass in the Philippines?

First Mass. On March 31, 1521, an Easter Sunday, Magellan ordered a Mass to be celebrated which was officiated by Father Pedro Valderrama, the Andalusion chaplain of the fleet, the only priest then. Conducted near the shores of the island, the First Holy Mass marked the birth of Roman Catholicism in the Philippines.

Very useful. it is to learn because history repeats itself so learning about it those mistakes not happen again.