The Early History of Chavacano de Zamboanga (1635 - 1718) Researched and written by: Zamboanga.com June 23, 1635 should be symbolically known as Dia del Chavacano de Zamboanga. Why you might ask This was the day that a permanent foothold was laid on Zamboanga by the Spanish government with the construction of the San Jose Fort, and the subsequent evolution and proliferation of a unique ...