The Butuan Ivory Seal or BIS is an ivory stamp or seal stamp or a privy seal associated with a Rhinoceros Ivory Tusk, dated 9th–12th century, was found in Libertad, Butuan in Agusan del Norte in south

Agusan del Norte, officially the Province of Agusan del Norte, is a province in the Caraga region of the Philippines. Its de jure capital is the city of Cabadbaran with several government offices loca