Aguingay is believed to be the daughter of Bulusan's neighboring tribe head who was born a beautiful girl with fair complexion.
The people of Bulusan believed that the town was attacked by a giant bird called Mampak which killed hundreds of tribesmen during the time of Aguingay.
It is also a common belief among the people of Bulusan that the villages' names originated from the landing of "Mampak" bird to its struggles and death.
The princess was saddened by the news and ordered the men to give them majestic burial, so high enough that the people could see the tombs from the town.
Casiguran, who continually skulls in the shadows, jealousy watching Bulusan and Agingay even if already has the faithful and understanding Irosin for wife.
Driven by extreme jealousy, Casiguran found the chance to eliminate the hate and when Apu Juban suddenly die of natural causes.
He did this by threatening and convincing Putiao, the village soothsayer, to stand false witness against Bulusan as the supposed killer of Apu Juban.
Despite Agingay's pleadings Casiguran remain unmoved, and the innocent Bulusan died after the Mampak bird feasts upon his carcass on top of the volcano.
Fearful of Casiguran, who has already assumed the position of village chieftain after the death of Apu Juban, Agingay complied as she climbed the volcano with her infant son by Bulusan.