Casiguran is one of the two original town of Aurora Province now comprising eight municipalities. Casiguran was founded by Spanish missionaries in June 13, 1609. But prior to their arrival, the early settles of the place were Dumagats/Agta’s followed by migrants from other places of the country. These migrants spoke different dialects such as Ilocano, Visayan, Bicol, Pampango, Gaddang, Itawis, Ibanag, Tagalog, etc. Thus, Casiguran languages evolve out of these dialects. The word CASIGURAN according to the folk legend got its name from the word “KASIGURUHAN” which colloquially means “safety” or “assurance”. Safety means defense/fortress or sanctuary for sailing ships during stormy weather. On the other hand assurance means that if an unmarried stranger come to this place, he/she unavoidable falls in love with someone and eventually gets married. When the Philippines became independent on July 4, 1946. Aurora was still part of Tayabas province (now Quezon Province) and Casiguran was a lone northern town. Its political jurisdiction is bounded on the north by the province of Isabella, on the west by Quirino province, and the south west by Barangay Dinadiawan which was then the boundary between Baler and Casiguran. Casiguran lies in the eastern part of Aurora Province some 353 kilometers from Manila or 120 kilometers from the capital town of Baler. It is bounded on the east by Pacific Ocean, on the morth by the Municipality of Dilasag, on the south by the Municipality of Dinalungan and on the west of Sierra Madre Mountain Ranges. The Municipality of Casiguran consist of twenty-four (24) barangays with the total population 27,577 as of 2017 CBMS census. Its total land area is 71,543 hectares, the greater area of which is forest were a variety of tropical trees and other forest product abound. With the vast Pacific Ocean and calm waters of Casiguran Sound fishing has become one of the major sources of livelihood of the Casiguranins as well as people of the municipalities of Aurora and neighboring province. In 1959 and 1966 the barrios of Dilasag and Dinalungan which were part of Casiguran and situated on its northern and southern portion, respectively were created municipalities.