During the 14th and 15th centuries much of what is now Sudan was overrun by Arab tribes and briefly occupied 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.