According to the legend, the people who established the first settlement in the land that became Infanta were led by an elderly leader named Nunong Karugtong. These settlers crossed the Sierra Madre Mountains from somewhere in what is now Rizal Province in search of better living conditions. After examining multiple sites, they eventually settled on a site near the Bantilan River, where the discovery of a huge Yam root convinced them that the site was ideal for settlement. This eventually became the site of the settlement which European colonizers would call Binangonan de Lampon, which in turn would eventually become the Municipality of Infanta.