General Mamerto Alejandrino Natividad (December 3, 1871 – November 09, 1897) was a haciendero and a Filipino military leader who led numerous successful battles during the Philippine Revolution against the Spaniards. He is credited with establishing army headquarters at Biak Na Bato, which today is a national park because of its historical significance. Together with Jose Clemente Zulueta, he wrote the proclamation entitled “To The Brave Sons of the Philippines”, which called for the expulsion of the friars from the Philippines. He was a signatory to the Biak Na Bato convention, but a steadfast dissenter to the Treaty of Biak Na Bato, which asked for peace and reforms. He preferred independence.