A number of factors contributed to the gradual impoverishment and decline of the Assume kingdom. The Arab expansion into Northern Africa cut off the kingdom’s access to the Red-Sea waterway (and to the markets which could be reached through it and on which a large part of the kingdom’s prosperity had been based). There is also evidence to suggest that some of the kingdom’s natural resources, such as gold and ivory, had been depleted. Very little is known about this phase of Ethiopian history, and scholars even disagree on the dates of its beginning and end.
The political center of Ethiopia seems to have gradually shifted to the southern and eastern parts of the Tigray region in the Post-Aksumite period. A few churches in these areas have been tentatively attributed to this period, but subsequent adaptations combined with the inability to obtain permissions to conduct archaeological surveys make dating difficult. It seems likely that churches continued to be built as well as hewn (cut) out of rock. A group of funerary hypogea (underground chambers) in the Hazier plain (in northern Ethiopia) may have been transformed into churches during the post-Aksumite period. This could be the case for churches such as Abreha-we-Atsbeha (below) and Thermos Munro (the paintings in these churches probably date from a later period). According to local oral traditions, a few iron crosses date to the Assume or Post-Aksumite periods, but the absence of reliable dating methods and the fact that such crosses were produced at least until the sixteenth century, makes it extremely difficult to verify these claims.