San Juan derived its name from San Juan de Bautista or St. John the Baptist, patron saint of the locality. Prior to the coming of the Spaniards, San Juan was a mere village until 1590 when it became a small encomienda and part of Sta. Ana de Sapa ruled by King Lacantagean and his wife Bouan. In 1783, San Juan became independent as a separate barrio of Sta. Ana.
During the American resime, San Juan was incorporated to Rizal by virtue of Act No. 137 issued by the 2nd US - Philippine Commission on June 11, 1901 and on Oct. 1903, Act #943 consolidated the municipality to San Felipe de Neri (now Mandaluyong City).
On March 27, 1907 Act No. 1625 separated the town from the jurisdiction of San Felipe Neri and gained independence as a municipality.
GEOGRAPHY
San Juan is situated in the central part of Metropolitan Manila. Its northern and western boundaries are Quezon City and the City of Manila respectively, while the city of Mandaluyong form its southern and eastern boundaries. It occupies 0.009% of Metropolitan Manila’s 636 sq. km. area.
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