In early 1924, a group of Ilocano settlers with a number of Kapampangans and Pangasinenses from Tarlac arrived in Casiguran, which was then part of Nueva Vizcaya.[6][7] Finding the natives unfriendly to them, the settlers moved along the coastline going north and settled finally to what is now called Dilasag.It was declared a sitio of barangay Culat and eventually a barrio of Casiguran in consideration of its rapid progress and development.In 1959, Quezon 1st District Representative Manuel Enverga introduced House Bill No.With its mountainous terrain, Dilasag also provides an ideal venue for trekking and mountain-climbing.