During the Spanish colonization, the soldiers of Capitan Nicanor Villarosa began to suffer from a disease called “bulao”, which symptoms include the yellowish coloration of the skin. The capitan summoned a well-known “babaylan” from Panay to heal his men.

As it was already dark, the healer noticed a tree covered with fireflies. He stripped a bark of the tree and from it concocted drinking water for the sick people. After several days, the sick began to heal and became stronger. Much later, Capitan Nicanor Villarosa named the place Dulao, after the healing tree, Mandulao