Prior to gaining joint representation, areas now under the respective jurisdictions of Malabon and Navotas were represented under the provinces of Manila (1898–1899) and Rizal (1907–1972), and Valenzuela under Bulacan (1898–1899; 1907–1972). These three municipalities were separated from their respective provinces to form the Metropolitan Manila Area on 7 November 1975 by virtue of Presidential Decree No. 824;[1] Metro Manila was represented in the Interim Batasang Pambansa as Region IV from 1978 to 1984.