Las Piñas  ', officially the ' (), is a in Metropolitan Manila, . According to the , it has a population of people. The story about the true origin of the city's name, "Las Piñas", varies. One version mentioned, that traders from the province of Cavite and Batangas shipped their first "piñas" (Spanish for pineapples) for sale to this town, before they were distributed to nearby markets. Another version related that it was "Las Peñas" (the rocks), evident by the quarrying of stones and adobe, which were used to construct buildings and bridges. The old church bell, from St. Joseph Parish Church, founded by Diego Cera, has been preserved inside the church museum. An inscription on the bell states, "Siendo cura del pueblo de Laspeñas el M.R.P. Padre Diego Cera se fundió este equilón año de 1820," showing that even during the time of Diego Cera, the town's first parish priest, the town was called "Las Peñas", for some time, and eventually was renamed "Las Piñas". Las Piñas was one of the earliest fishing settlements on the shores of Manila Bay. It was proclaimed as a province of Manila either in 1762 or 1797. Agustin, a Spanish historian, and Fr. Juan de Medina placed it at 1762. Las Piñas was formerly called "Las Pilas" due to its separation from Parañaque due to tribal conflicts. On the other hand, Manuel Buzeta recorded the date at 1797. Felix Timbang was the first "gobernadorcillo" in 1762 while Mariano Ortiz was the first municipal president of the town of Las Piñas. Las Piňas is famous for its Bamboo Organ, which was built by Fr. Diego Cera and completed in 1824. In 1880, the city experienced an outbreak of cholera and smallpox leading to the loss of many lives. Years later, Las Piňas also became a central battleground between Spanish and Philippine forces during the Philippine Revolution. The town of Las Piñas was also a major war theater during the 1896 Philippine Revolution, as it was occupied by forces of Gen. Emilio Aguinaldo. Las Piñas was occupied by the Japanese during World War II and liberated by the combined American and Filipino forces. In 1901, the municipality of Las Piñas was separated from Manila and incorporated to the newly created province of Rizal pursuant to the Philippine Commission Act No. 137.