Magellan's fleet landed in the Philippines on 16 March 1521, and its commander immediately set about converting the local people to Christianity. He befriended local leaders on the island of Limasawa, and on 31 March he held the first Mass in the Philippines, planting a cross on the island's highest hill. Wikipedia reports that most accepted the new religion readily, but the island of Mactan resisted. On 27 April, Magellan and members of his crew attempted to subdue the Mactan natives by force, but in the ensuing battle, the Europeans were overpowered and Magellan was killed.
There is an unauthenticated note on Wikipedia's Mactan page claiming that "[according to oral tradition,] the island where the Battle of Mactan might have taken place in is Poro Island in the northeast instead. The oral tradition is backed by recent archaeological evidence of such a battle taking place in Poro island during the 16th century."
All of the islands named in this story are quite insignificant on the map of the Philippines. Mactan is just off the coast of Cebu - the 9th largest islands in the Philippines, and the world's 126th largest. (It's about twice the size of Lewis and Harris, the third largest of the British Ises). Mactan today is home to some 470,000 people, making it the most densely populated island in the Philippines.
Poro Island is another island in Cebu Province, more remote from Cebu island itself. It's somewhat larger than Mactan, but has a population today of little more than 33,000. Limasawa is in a different province, and even more tiny (less than three square miles in area). In 2015 it had a population of 6,061.
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