The Ethiopian Empire, historically known as Abyssinia or simply Ethiopia, was a sovereign state that encompassed the present-day territories of Ethiopia and Eritrea. It existed from the establishment of the Solomonic dynasty by Yekuno Amlak around 1270 until the 1974 coup d'état by the Derg, which ended the reign of the final Emperor, Haile Selassie. In the late 19th century, under Emperor Menelik II, the empire expanded significantly to the south, and in 1952, Eritrea was federated under Selassie's rule. Despite being surrounded by hostile forces throughout much of its history, the empire maintained a kingdom centered on its ancient Christian heritage.

Founded in 1270 by Yekuno Amlak, who claimed to descend from the last Aksumite king and ultimately King Solomon and the Queen of Sheba, it replaced the Agaw kingdom of the Zagwe. While initially a rather small and politically unstable entity, the Empire managed to expand significantly under the crusades of Amda Seyon I (1314–1344) and Dawit I (1382–1413), temporarily becoming the dominant force in the Horn of Africa. The Ethiopian Empire would reach its peak during the long reign of Emperor Zara Yaqob (1434–1468). He consolidated the conquests of his predecessors, built numerous churches and monasteries, encouraged literature and art, centralized imperial authority by substituting regional warlords with administrative officials, and significantly expanded his hegemony over adjacent Islamic territories.

The neighboring Muslim Adal Sultanate began to threaten the empire by repeatedly attempting to invade it, finally succeeding under Imam Mahfuz. Mahfuz's ambush and defeat by Emperor Lebna Dengel brought about the early 16th-century jihad of the Ottoman-supported Adalite Imam Ahmed Gran, who was defeated in 1543 with the help of the Portuguese. Greatly weakened, much of the Empire's southern territory and vassals were lost due to the Oromo migrations. In the north, in what is now Eritrea, Ethiopia managed to repulse Ottoman invasion attempts, although losing its access to the Red Sea to them. Reacting to these challenges, in the 1630s Emperor Fasilides founded the new capital of Gondar, marking the start of a new golden age known as the Gondarine period. It saw relative peace, the successful integration of the Oromo and a flourishing of culture. With the deaths of Emperor Iyasu II (1755) and Iyoas I (1769) the realm eventually entered a period of decentralization, known as the Zemene Mesafint where regional warlords fought for power, with the emperor being a mere puppet.

Emperor Tewodros II (r. 1855–1868) put an end to the Zemene Mesafint, reunified the Empire and led it into the modern period before dying during the British Expedition to Abyssinia. His successor Yohannes IV engaged primarily in war and successfully fought the Egyptians and Mahdists before dying against the latter in 1889. Emperor Menelik II, now residing in Addis Ababa, subjugated many peoples and kingdoms in what is now western, southern, and eastern Ethiopia, like Kaffa, Welayta, Harar, and other kingdoms. Thus, by 1898 Ethiopia expanded into its modern territorial boundaries. In the northern region, he confronted Italy's expansion. Through a resounding victory over the Italians at the Battle of Adwa in 1896, utilizing modern imported weaponry, Menelik ensured Ethiopia's independence and confined Italy to Eritrea.

Later, after the Second Italo-Ethiopian War, Benito Mussolini's Italian Empire occupied Ethiopia and established Italian East Africa, merging it with neighboring Eritrea and the Italian Somaliland colonies to the south-east. During World War II, the Italians were driven out of Ethiopia with the help of the British army. The Emperor returned from exile and the country became one of the founding members of the United Nations. However, the 1973 Wollo famine and domestic discontent led to the fall of the Empire in 1974 and the rise of the Derg.

After the fall of the Kingdom of Aksum in the 10th century AD, the Ethiopian Highlands would fall under the rule of the Zagwe Dynasty. The new rulers were Agaws that had come from the Lasta region, later ecclesiastical texts accused this dynasty of not having pure "Solomonic" stock and derided their achievements. Even at the zenith of their power, most Christians would consider them to be usurpers. However, the architecture of the Zagwe shows a connotation of earlier Aksumite traditions, among those can be seen in Lalibela, the building of rock hewn churches first appeared in the late Aksumite era and reached its peak under the Zagwe.

The Zagwe were not able to stop squabbling over the throne, diverting men, energy and resources that could have been used to affirm the dynasty's authority. By the late 13th century, a young Amhara nobleman named Yekuno Amlak rose to power in Bete Amhara. He was strongly supported by the Orthodox Church as he promised to make the church a semi independent institution, he had also enjoyed support from the neighboring Muslim Makhzumi dynasty. Yekuno Amlak then rebelled against the Zagwe king and defeated him at the Battle of Ansata. Taddesse Tamrat argued that this king was Yetbarak, but due to a local form of damnatio memoriae, his name was removed from the official records. A more recent chronicler of Wollo history, Getatchew Mekonnen Hasen, states that the last Zagwe king deposed by Yekuno Amlak was Na'akueto La'ab.

Yekuno Amlak would rise to the throne by 1270 AD. He was allegedly a descendant of the last king of Aksum, Dil Na'od, and hence the royal kings of Aksum. Through the Aksumite royal lineage, it was also claimed that Yekuno Amlak was a descendant of the biblical king Solomon. The canonical form of the claim was set out in legends recorded in the Kebra Nagast, a 14th century text. According to this, the Queen of Sheba, who supposedly came from Aksum, visited Jerusalem where she conceived a son with King Solomon. On her return to her homeland of Ethiopia, she gave birth to the child, Menelik I. He and his descendants (which included the Aksumite royal house) ruled Ethiopia until overthrown by the Zagwe usurpers. Yekuno Amlak, as a supposed direct descendant of Menelik I, was therefore claimed to have "restored" the Solomonic line.