The passage of Republic Act No. 8470 and its subsequent ratification by plebiscite on 7 March 1998 separated from Davao del Norte's first and second districts a total of eleven municipalities to create the new province of Compostela Valley (now named Davao de Oro), which itself was apportioned into two new congressional districts.[1] The new province's two districts first elected their own representatives in the 1998 elections.
^ abCongressional Library Bureau. "Roster of Philippine Legislators". Republic of the Philippines, House of Representatives. Retrieved February 17, 2017.