Caloocan City

The city is historically significant because it was the center of activities for the Katipunan, the secret militant society that launched the Philippine Revolution during the Spanish occupation of the Philippines. It was in a house in Caloocan where secret meetings were held by Andres Bonifacio and his men, and it was within the city's perimeters where the very first armed encounter took place between the Katipunan and the Spaniards.

The word caloocan comes from the Tagalog root word lo-ok; kalook-lookan (or kaloob-looban) means "innermost area". The City borders many other cities such as Quezon City, Manila, Malabon, Navotas, Valenzuela and San Jose Del Monte Bulacan in the north. During the formation of Rizal Province, Caloocan was included in its matrix until 1975.