Act No. 137
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Rizal Act 137 was initiated by the First Philippine Commission, which organized the “politico-military district of Morong” into the “Province of Rizal” effective June 11, 1901. The city was named after national hero Jose Rizal.
The newly formed province consisted of 29 municipalities, 18 from the old Province of Manila (Cainta, Caloocan, Las Piñas, Mariquina (Marikina), Montalban (Rodriguez), Muntinlupa, Navotas, Novaliches, Parañaque, Pasig, Pateros, Pineda (Pasay), San Felipe Neri (Mandaluyong), San Juan del Monte (San Juan), San Mateo, San Pedro Macati (Makati), Taguig, Tambobong (Malabon)); and 11 from the Politico-Militar District of Morong, (Angono, Baras, Binangonan, Antipolo, Cardona, Jalajala, Morong, Pililla, Tanay, Taytay and Teresa). The City of Manila from the old Province of Manila was treated as a separate entity. The seat of the provincial government was Pasig.
Parts of Caloocan, and later on portions of Novaliches, Marikina and San Juan, would later be used to form Quezon City. The city was formally established in 1939.
The Amended Province of Rizal
By virtue of Presidential Decree No. 824, on November 7, 1975, 12 Rizal towns were incorporated into the newly formed Metro Manila Region, These were Las Piñas, Parañaque, Muntinlupa, Taguig, Pateros, Makati, Mandaluyong, San Juan, Malabon, Navotas, Pasig and Marikina and the 3 cities of Caloocan, Pasay and Quezon City, thus leaving the province of Rizal with 14 municipalities.