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Unisan, originally called Kalilayan, is perhaps one of the oldest towns in the Philippines. As early as 1521, the town of Kalilayan was founded by Malayan settlers. All other towns in the country were established not earlier than 1565, when Spain formally occupied the Philippines as a colony. During the latter part of the 19th century, traditions said that the real founder of the town was a Malayan queen called of Ladya. Hence her title was "Queen of Kalilayan