 4867 on May 8, 1967 split the old Davao Province into Davao del Norte, Davao del Sur and Davao Oriental.Per Section 4 of R.A. 4867, the incumbent Davao Province representative was to indicate which of the three new provinces he wished to continue to represent; Rep. Lorenzo Sarmiento chose Davao del Norte, which left the seats for Davao del Sur (together grouped with the chartered city of Davao) and Davao Oriental open for the special elections scheduled for November 14, 1967.Davao del Sur, along with Davao City, were represented together from the second half of the 6th Congress until the end of the 7th Congress.