From the 12th, and especially the 13th century, Alodia was declining, possibly because of invasions from the south, droughts and a shift of trade routes. In the 14th century, the country might have been ravaged by the plague, while Arab tribes began to migrate into the Upper Nile valley. By around 1500 Soba had fallen to either Arabs or the Funj. This likely marked the end of Alodia, although some Sudanese oral traditions claimed that it survived in the form of the kingdom of Fazughli within the Ethiopian–Sudanese borderlands. After the destruction of Soba, the Funj established the Sultanate of Sennar, ushering in a period of Islamization and Arabization.