Axum (or Aksum) is the traditional capitol of Aksumite Kingdom, which later became known as Abyssinia or Ethiopia. The Ethiopian Orthodox Tewahedo Church was the state religion (or established religion or “official religion”) of Ethiopia before the fall of Emperor Haile Selassie in the Revolution of 1974. “Tewahedo” means “unified” in English.) One of the titles of the Patriarch (or head) of the Ethiopian Orthodox Tewahedo Church is “Archbishop of Axum.”
The Ethiopian Orthodox Church, despite the inclusion of the word “Orthodox” in its name, is not related to the larger Orthodox Communion (including the Greek, Russian, Serbian, etc. Orthodox Churches). Rather, the Ethiopian Orthodox Church is an Oriental Orthodox Church, which is in communion with the Coptic Orthodox Church, the Syrian Orthodox Church, and others.