1484. Perhaps it was under Joel when the kingdom witnessed a last, brief renaissance. After the death or deposition of king Joel the kingdom might have collapsed. The cathedral of Faras came out of use after the 15th century, just as Qasr Ibrim was abandoned by the late 15th century. The palace of Gebel Adda came out of use after the 15th century as well. In 1518, there is one last mention of a Nubian ruler, albeit it is unknown where he resided and if he was Christian or Muslim. There were no traces of an independent Christian kingdom when the Ottomans occupied Lower Nubia in the 1560s, while the Funj had come into possession of Upper Nubia south of the third cataract. Further developments Political By the early 15th century, there is mention of a king of Dongola, most likely independent from the influence of the Egyptian sultans. Friday prayers held in Dongola failed to mention them as well. These new kings of Dongola were probably confronted with waves of Arab migrations and thus were too weak to conquer the Makurian splinter state of Lower Nubia. It is possible that some petty kingdoms that continued the Christian Nubian culture developed in the former Makurian territory, like for example on Mograt island, north of Abu Hamed. Another small kingdom would have been the Kingdom of Kokka, founded perhaps in the 17th century in the no-mans-land between the Ottoman Empire in the north and the Funj in the south. Its organization and rituals bore clear similarities to those of Christian times. Eventually the kings themselves were Christians until the 18th century. In 1412, the Awlad Kenz took control of Nubia and part of Egypt above the Thebaid. Ethnographic and linguistic The Nubians upstream of Al Dabbah started to assume an Arabic identity and the Arabic language, eventually becoming the Ja'alin, claimed descendants of Abbas, uncle of Muhammad. The Ja'alin were already mentioned by David Reubeni, who travelled through Nubia in the early 16th century. They are now divided into several sub-tribes, which are, from Al Dabbah to the conjunction of the Blue and White Nile: Shaiqiya, Rubatab, Manasir, Mirafab and the "Ja'alin proper". Among them, Nubian remained a spoken language until the 19th century. North of the Al Dabbah developed three Nubian sub-groups: The Kenzi, who, before the completion of the Aswan Dam, lived between Aswan and Maharraqa, the Mahasi, who