Long before the Spanish colonization of the Philippines, a group of aventurous Malays residing in what is now Rizal Province under the leadership of Nunong Karugtong crossed the wilderness of Sierra Madre to find a better settlement. After several days of land travel, the group made a stop-over in the first plain area they reached. This area is now known as barangay Comon. Karugtong did not like the place because the area lies between two rivers. so they moved on until they reached the present Dinahican beach. Again, the leader did not like the place because of its closeness to the sea. They turned back until hunger, thirst and fatigue forced them to take a rest.
Aged, tired and weary, Nunong Karugtong fell asleep while his men kept on gathering food and preparing for a temporary shelter. The men in search for food found a giant wild yam (ube) which, because of its extra-ordinary size, could not be carried by four men. With the giant yam, they returned to the place where they left the sleeping leader and presented the yam. But from his deep sleep the aged leader could not easily get up. It took some of this men to help him up and see the giant yam. Fully awake, the old man realized that the area was an ideal place for settlement due to the presence of clear water flowing in the nearby river. That area is the present barangay Bantilan. It is a plain land drained by the Bantilan River. Decided on making the area as their permanent settlement, Nunong Karugtong thought of having the place named. But he could not think of an ideal name for the place. He asked for suggestions from his men. One of his men who had helped him wake up from his deep sleep, suggested that the area be called "Binangonan del Ampon." The word recalls the staggering old leader being assisted by his men to get up much like a baby sitter would her wobbly toddler ward. The group unanimously agreed and since then, the place has been called Binangonan del Ampon. This latter name is probably the correct one rather than "Binangonan de Lampon" which a visiting Frenchman, Alfred Marche, called the place in 1879. The name was later changed to Infanta in honor of the eldest daughter of King Philip II of Spain.