suggests the town suffered from overgrazing and overcultivation. By 1276 al-Abwab, previously described as the northernmost Alodian province, was recorded as an independent splinter kingdom ruling over vast territories. The precise circumstances of its secession and its relations with Alodia thereafter remain unknown. Based on pottery finds it has been suggested that al-Abwab continued to thrive until the 15th and perhaps even the 16th century. In 1286 a Mamluke prince sent messengers to several rulers in central Sudan. It is not clear if they were still subject to the king in Soba or if they were independent, implying a fragmentation of Alodia into multiple petty states by the late 13th century. In 1317 a Mamluk expedition pursued Arab brigands as far south as Kassala in Taka (one of the regions which received a Mamluk messenger in 1286), marching through al-Abwab and Makuria on their return. During the 14th and 15th centuries much of what is now Sudan was overrun by Arab tribes and briefly conquered by the Adal Sultanate. They perhaps profited from the plague which might have ravaged Nubia in the mid-14th century killing many sedentary Nubians, but not affecting the nomadic Arabs. They would have then intermixed with the remaining local population, gradually taking control over land and people, greatly benefiting from their large population in spreading their culture. The first recorded Arab migration to Nubia dates to 1324. It was the disintegration of Makuria in the late 14th century that, according to archaeologist William Y. Adams, caused the "flood gates" to "burst wide open". Many, initially coming from Egypt, followed the course of the Nile until they reached Al Dabbah. Here they headed west to migrate along the Wadi Al-Malik to reach Darfur or Kordofan. Alodia, in particular the Butana and the Gezira, was the target of those Arabs who had lived among the Beja in the Eastern Desert for centuries. Initially, the kingdom was able to exercise authority over some of the newly arrived Arab groups, forcing them to pay tribute. The situation grew increasingly precarious as more Arabs arrived. By the second half of the 15th century, Arabs had settled in the entire central Sudanese Nile valley, except for the area around Soba, which was all that was left of Alodia's domain. In 1474 it was recorded that Arabs founded the town of Arbaji on the Blue Nile, which would quickly develop into an important