 All these tales of treasures hidden in Basilan's many remote, unpopulated islets gave it the nickname "Treasure Islands of the Southern Seas", immortalized in the official anthem of the Province of Basilan, "Fair Basilan", composed by Basilan lyricist and composer Tranquilino Gregorio.Basilan's earliest settlers was traditionally believed to be the Orang Dampuans originating from the islands of Eastern Indonesia, who are supposed to be the ancestors of the native Yakans.They are variously called the Orang Dyaks or the Tagihamas.