Malolos (mälōˈlōs) [key], city (1990 pop. 125,178), capital of Bulacan prov., SW Luzon, the Philippines, N of Manila. It is an old marketing center for surrounding farms. The Spanish settled there in 1580. Malolos was the capital of the Philippine republic proclaimed (June, 1898) by the insurrectionary leader Emilio Aguinaldo; U.S. forces captured the town in Mar., 1899. It is the seat of the Bulacan College of Arts and Trades.