T'Boli

https://en.wikipedia.org/wiki/Tboli_people
The Tboli people (IPA: ['tʔbɔli]) are one of the indigenous peoples of South Cotabato in southern Mindanao. In the body of ethnographic and linguistic literature on Mindanao, their name is variously spelt Tboli, T'boli, Tböli, Tagabili, Tagabilil, Tagabulul and Tau Bilil. Their endonym is Tboli. Their whereabouts and identity are somewhat imprecise in the literature; some publications present the Tboli and the Tagabili as distinct peoples; some locate the Tbolis in the vicinity of Lake Buluan in the Cotabato Basin or in Agusan del Norte. The Tbolis, then, reside on the mountain slopes on either side of the upper Alah Valley and the coastal area of Maitum, Maasim and Kiamba. In former times, the Tbolis also inhabited the upper floor of the Alah Valley. After World War II and the arrival of settlers from other parts of the Philippines, they have been gradually pushed to the mountain slopes. As of now, they have almost been expelled from the fertile valley floor.