Kingdom of Aksum
The Kingdom of Aksum at its height extended across portions of present-day Eritrea, northern Ethiopia, Yemen, and northern Sudan. The capital city of the kingdom was Aksum, now in northern Ethiopia. Other important cities included Adulis, Matara and Qohaito, all of which are now in Eritrea.
The Aksumite people represented a mix of Cushitic and Semitic speaking people in Ethiopia and southern Arabia.
The Aksumite kings had the official title negusa nagast - King of Kings. Aksumite kings traced their lineage to David, Solomon and the Queen of Sheba. This royal heritage was claimed by all emperors of Ethiopia.
Aksum traded with India and Rome (later Byzantium, a strong cultural influence on Aksum), exporting ivory, tortoise shell, gold and emeralds, and importing silk and spices. Aksum's access to both the Red Sea and the Upper Nile enabled its strong navy to profit in trade between various African (Nubia), Arabian (Yemen), and Indian states.
In the 2nd century AD, Aksum acquired tributary states on the Arabian Peninsula across the Red Sea, and conquered northern Ethiopia. In 350 AD, they conquered the Kingdom of Kush.
Aksum remained a strong empire and trading power until the rise of Islam in the seventh century AD. However, because the Axumites had sheltered Muhammad's first followers, the Muslims never attempted to overthrow Aksum as they spread across the face of Africa.
Eventually, the Islamic Empire took control of the Red Sea and most of the Nile, forcing Aksum into economic isolation. However, it still had relatively good relations with all of its Muslim neighbors. Two Christian states northwest of Axum (in modern day Sudan), Maqurra and Alwa, survived until the thirteenth century when they were finally forced by Muslim migration to become Islamic. Aksum, however, remained untouched by the Islamic movements across Africa.