Subanen People's Kingdom (SPK) Governorate of Basilan Islands Map: Subanen People's Ancient Territory in Mindanao Islands, Southwestern Philippines called as (G'bansa Subanen or translated in English as Subanen Nation) who settled the territory since more than 4,200 years B.C. through archeological traces unearthed by archeologists. Recognized by the Philippine Government under RA-8371.