The historical setting
The Kingdom of Aksum, or the Aksumite Empire, was a kingdom in the Horn of Africa and South Arabia from classical antiquity to the Middle Ages, based in what is now Eritrea and Northern Ethiopia, and spanning present-day Djibouti, Sudan, Yemen and Saudi Arabia. Emerging from the earlier Dmt civilization, the kingdom was founded in the 1st century. The city of Axum served as the kingdom's capital. The Kingdom of Aksum was considered one of the four great powers of the 3rd century by Mani, the founder of Manichaeism, alongside Persia, Rome, and China. Aksum continued to expand under the reign of Gedara (c. 200–230), who was the first king to be involved in South Arabian affairs.
His reign resulted in the control of much of western Yemen, such as the Tihama, Najran, al-Ma'afir, Zafar (until c. 230), and parts of Hashid territory around Hamir in the northern highlands until a joint Himyarite-Sabean alliance pushed them out.
Coinage
The Empire of Aksum was one of the first African polities to issue its own coins, which bore legends in Geez and Greek. From the reign of Endybis up to Armah (c. 270 – c. 610), gold, silver and bronze coins were minted. Issuing coinage in ancient times was an act of great importance in itself, for it proclaimed that the Aksumite Empire considered itself equal to its neighbours. Many of the coins are used as signposts about what was happening when they were minted. An example being the addition of the cross to the coin after the conversion of the empire to Christianity. The presence of coins also simplified trade, and was at once a useful instrument of propaganda and a source of profit to the empire.
Religion
Before its conversion to Christianity, the Aksumites practiced a polytheistic religion related to the religion practiced in southern Arabia. This included the use of the crescent-and-disc symbol used in southern Arabia and the northern horn. In the UNESCO-sponsored General History of Africa, French archaeologist Francis Anfray suggests that the Aksumites worshipped Astar, his son Mahrem, and Beher. Before converting to Christianity, King Ezana II's coins and inscriptions show that he might have worshiped the gods Astar, Beher, Meder/Medr, and Mahrem. Another of Ezana's inscriptions is clearly Christian and refers to "the Father, the Son, and the Holy Spirit".
Around 324 AD the King Ezana II was converted to Christianity by his teacher Frumentius, who established the Axumite Coptic Church, which later became the modern Ethiopian Orthodox Church. Frumentius taught the emperor while he was young, and it is believed that at some point staged the conversion of the empire. We know that the Aksumites converted to Christianity because in their coins they replaced the disc and crescent with the cross. Frumentius was in contact with the Church of Alexandria, and was appointed Bishop of Ethiopia around the year 330. The Church of Alexandria never closely managed the affairs of the churches in Aksum, allowing them to develop their own unique form of Christianity.
Foreign relations, trade, and economy
Covering parts of what is now northern Ethiopia and southern and eastern Eritrea, Aksum was deeply involved in the trade network between the Indian subcontinent and the Mediterranean (Rome, later Byzantium), 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. The main exports of Aksum were, as would be expected of a state during this time, agricultural products. The land was much more fertile during the time of the Aksumites than now, and their principal crops were grains such as wheat, barley and teff. The people of Aksum also raised cattle, sheep, and camels.
Wild animals were also hunted for things such as ivory and rhinoceros horns. They traded with Roman traders as well as with Egyptian and Persian merchants. The empire was also rich with gold and iron deposits. These metals were valuable to trade, but another mineral was also widely traded: salt. Salt was abundant in Aksum and was traded quite frequently. It 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 first century.