Massawa: Adulis

The Decline of the Ethiopian Empire and the End of Christianity in Southern Arabia.

Calif Omar
The Islamic invaders were dazzled at the extent of the riches of the church and the splendour of the Ethiopian Christian culture at the time. The Church was their special target for destruction as she was the most important repository of the cultural heritage of Christian Ethiopia. They massacred the clergy, burnt the holy books, pulled down many beautiful churches and monastaries amd stole their riches.
[Kesis Dr. E.A Abebe; The Ethiopian Church History, pg-44]