Rodriguez, officially the Municipality of Rodriguez (), formerly known (and still commonly called) as Montalban, is a 1st class municipality in the province of Rizal, Philippines. According to the 2020 census, it has a population of 443,954 people making it the most populous municipality in the country. Pending an affirmation through plebiscite, Republic Act No. 11812 repealed Batas Pambansa Blg. 275 and intend to revert to its original municipal name, Montalban. It is the northernmost town in the province and comes after San Mateo, Rizal, and Quezon City coming from Metro Manila. The town is located on the slopes of the Sierra Madre mountain range and it is the largest town in Rizal province with an area of . It is also the location of the Montalban Gorge that is associated with the Legend of Bernardo Carpio. The gorge forms part of a protected area known as the Pamitinan Protected Landscape. The municipality borders San Mateo and Antipolo, Rizal on the south, Norzagaray and San Jose Del Monte, Bulacan on the north, Quezon City and Caloocan on the west and General Nakar, Quezon on the east. It is one of the richest municipalities in the Philippines, ranking third in 2016 with an income of . Etymology The town's former official name of Montalban derives from the Spanish word Monte (Mountain), in reference to the numerous hills found within and surrounding the town. A common name for the municipality up to the present, it was its official name from its founding in 1871 until 1982 when the Batasang Pambansa officially renamed it to Rodriguez under Batas Pambansa Blg. 275 in honor of Eulogio Rodriguez, Sr., a native of the municipality who served as its first municipal president and Senate President. History Based on the 1954 journal History and Cultural Life of Montalban and its Barrios, what would then be the town of Montalban was formerly the barrio Balite which was under the jurisdiction of the town of San Mateo during the Spanish period. The town was then founded by Fr. Eustaquio of Pasig in 1871. On another account, San Mateo, with its large size, was partitioned on April 27, 1871, when Captain General Rafael Izquierdo issued a decree separating the barrios of Balite, Burgos, Marang and Calipahan from San Mateo and formed them into the new municipality of Montalban. According to the Executive Summary included in the Annual Audit Reports of