The Aksumite Empire or Axumite Empire (sometimes called the Kingdom of Aksum or Axum), (Ge'ez: አክሱም), was an important trading nation in northeastern Africa, growing from the proto-Aksumite period ca. 4th century BC to achieve prominence by the 1st century AD. It is also the alleged resting place of the Ark of the Covenant and the home of the Queen of Sheba.
The Kingdom of Aksum benefited from a major transformation of the maritime trading system that linked the Roman Empire and India. This change took place around the start of the Common Era. The older trading system involved coastal sailing and many intermediary ports. The Red Sea was of secondary importance to the Persian Gulf and overland connections to the Levant. Starting around 100 BC a route from Egypt to India was established, making use of the Red Sea and using monsoon winds to cross the Arabian Sea directly to southern India. By about 100 AD the volume of traffic being shipped on this route had eclipsed older routes. Roman demand for goods from southern India increased dramatically, resulting in greater number of large ships sailing down the Red Sea from Roman Egypt to the Arabian Sea and India.

The Kingdom of Aksum was ideally located to take advantage of the new trading situation. Adulis soon became the main port for the export of African goods, such as ivory, incense, gold, and exotic animals. In order to supply such goods the kings of Aksum worked to develop and expand an inland trading network. A rival, and much older trading network that tapped the same interior region of Africa was that of the Kingdom of Kush, which had long supplied Egypt with African goods via the Nile corridor. By the 1st century AD, however, Aksum had gained control over territory previously Kushite. The Periplus of the Erythraean Sea explicitly describes how ivory collected in Kushite territory was being exported through the port of Adulis instead of being taken to Meroë, the capital of Kush. During the 2nd and 3rd centuries the Kingdom of Aksum continued to expand their control of the southern Red Sea basin. A caravan route to Egypt was established which bypassed the Nile corridor entirely. Aksum succeeded in becoming the principal supplier of African goods to the Roman Empire, not least as a result of the transformed Indian Ocean trading system.[2]

In the 3rd century, Aksum began interfering in South Arabian affairs, controlling at times the western Tihama region among other areas. By the late 3rd century it had begun minting its own currency and was named by Mani as one of the four great powers of his time along with Persia, Rome, and China. It converted to Christianity in 325 or 328 under King Ezana and was the first state ever to use the image of the cross on its coins. At its height, Aksum controlled northern Ethiopia, Eritrea, northern Sudan, southern Egypt, Djibouti, Yemen, and southern Saudi Arabia, totalling 1.25 million km².[3]

It was a quasi-ally of Byzantium against the Persian Empire of the day and declined after the 7th century due to unknown reasons, but informed speculation suggests the rise of Islam heavily impacted its ability to trade with the Far East in the era when shipping was limited to coastal navigation as well as cut it off from its principal markets in Alexandria, Byzantium and Southern Europe.

After a second golden age in the early 6th century, the empire began to decline, eventually ceasing its production of coins in the early 7th century. It finally dissolved with the invasion of the pagan or Jewish queen Gudit in the 9th or 10th century, resulting in a Dark Age about which little is known until the rise of the Zagwe dynasty.