The Kingdom of Namatota was an Islamic kingdom that once existed in what is now Kaimana Regency from the 16th century until the early 20th century. The center of power of the Namatota Kingdom was located on Namatota Island, and its territory covered the area from Arguni Bay to Umar Bay. The Namatota Kingdom maintained political relations with the Sultanate of Tidore. The inhabitants of the Namatota Kingdom spoke the Irarutu language. In Namatota, Islam was used as an identity to legitimize the ruler’s authority and the kingdom did not have religious institutions to the dissemination of its teachings.