Tewodros II's origins were in the Era of the Princes, but his ambitions were not those of the regional nobility. He sought to reestablish a cohesive Ethiopian state and to reform its administration and church. He did not initially claim Solomonic lineage but did seek to restore Solomonic hegemony, and he considered himself the "Elect of God." Later in his reign, suspecting that foreigners considered him an upstart and seeking to legitimize his reign, he added "son of David and Solomon" to his title.

Tewodros's first task was to bring Shewa under his control. During the Era of the Princes, Shewa was, even more than most provinces, an independent entity, its ruler even styling himself negus. In the course of subduing the Shewans, Tewodros imprisoned a Shewan prince, Menelik, who would later become emperor himself. Despite his success against Shewa, Tewodros faced constant rebellions in other provinces. In the first six years of his reign, the new ruler managed to put down these rebellions, and the empire was relatively peaceful from about 1861 to 1863, but the energy, wealth, and manpower necessary to deal with regional opposition limited the scope of Tewodros's other activities. By 1865 other rebels had emerged, including Menelik, who had escaped from prison and returned to Shewa, where he declared himself negus.

In addition to his conflicts with rebels and rivals, Tewodros encountered difficulties with the European powers. Seeking aid from the British government (he proposed a joint expedition to conquer Jerusalem), he became unhappy with the behavior of those Britons whom he had counted on to advance his request, and he took them hostage. In 1868, as a British expeditionary force sent from India to secure release of the hostages stormed his stronghold, Tewodros committed suicide.

Tewodros never realized his dream of restoring a strong monarchy, although he took some important initial steps. He sought to establish the principle that governors and judges must be salaried appointees. He also established a professional standing army, rather than depending on local lords to provide soldiers for his expeditions. He also intended to reform the church, believing the clergy to be ignorant and immoral, but he was confronted by strong opposition when he tried to impose a tax on church lands to help finance government activities. His confiscation of these lands gained him enemies in the church and little support elsewhere. Essentially, Tewodros was a talented military campaigner but a poor politician.

The kingdom at Tewodros's death was disorganized, but those contending to succeed him were not prepared to return to the Zemene Mesafint system. One of them, crowned Tekla Giorgis, took over the central part of the highlands. Another, Kasa Mercha, governor of Tigray, declined when offered the title of ras in exchange for recognizing Tekla Giorgis. The third, Menelik of Shewa, came to terms with Tekla Giorgis in return for a promise to respect Shewa's independence. Tekla Giorgis, however, sought to bring Kasa Mercha under his rule but was defeated by a small Tigrayan army equipped with more modern weapons than those possessed by his Gonder forces. In 1872 Kasa Mercha was crowned negusa nagast in a ceremony at the ancient capital of Aksum, taking the throne name of Yohannis IV.

Yohannis was unable to exercise control over the nearly independent Shewans until six years later. From the beginning of his reign, he was confronted with the growing power of Menelik, who had proclaimed himself king of Shewa and traced his Solomonic lineage to Lebna Dengel. While Yohannis was struggling against opposing factions in the north, Menelik consolidated his power in Shewa and extended his rule over the Oromo to the south and west. He garrisoned Shewan forces among the Oromo and received military and financial support from them. Despite the acquisition of European firearms, in 1878 Menelik was compelled to submit to Yohannis and to pay tribute; in return, Yohannis recognized Menelik as negus and gave him a free hand in territories to the south of Shewa. This agreement, although only a truce in the long-standing rivalry between Tigray and Shewa, was important to Yohannis, who was preoccupied with foreign enemies and pressures. In many of Yohannis's external struggles, Menelik maintained separate relations with the emperor's enemies and continued to consolidate Shewan authority in order to strengthen his own position. In a subsequent agreement designed to ensure the succession in the line of Yohannis, one of Yohannis's younger sons was married to Zawditu, Menelik's daughter.

In 1875 Yohannis had to meet attacks from Egyptian forces on three fronts. The khedive in Egypt envisioned a "Greater Egypt" that would encompass Ethiopia. In pursuit of this goal, an Egyptian force moved inland from present-day Djibouti but was annihilated by Afar tribesmen. Other Egyptian forces occupied Harer, where they remained for nearly ten years, long after the Egyptian cause had been lost. Tigrayan warriors defeated a more ambitious attack launched from the coastal city of Mitsiwa in which the Egyptian forces were almost completely destroyed. A fourth Egyptian army was decisively defeated in 1876 southwest of Mitsiwa.

Italy was the next source of danger. The Italian government took over the port of Aseb in 1882 from the Rubattino Shipping Company, which had purchased it from a local ruler some years before. Italy's main interest was not the port but the eventual colonization of Ethiopia. In the process, the Italians entered into a long-term relationship with Menelik. The main Italian drive was begun in 1885 from Mitsiwa, which Italy had occupied. From this port, the Italians began to penetrate the hinterland, with British encouragement. In 1887, after the Italians were soundly defeated at Dogali by Ras Alula, the governor of northeastern Tigray, they sent a stronger force into the area.

Yohannis was unable to attend to the Italian threat because of difficulties to the west in Gonder and Gojam. In 1887 Sudanese Muslims, known as Mahdists, made incursions into Gojam and Begemdir and laid waste parts of those provinces. In 1889 the emperor met these forces in the Battle of Metema on the Sudanese border. Although the invaders were defeated, Yohannis himself was fatally wounded, and the Ethiopian forces disintegrated. Just before his death, Yohannis designated one of his sons, Ras Mengesha Yohannis of Tigray, as his successor, but this gesture proved futile, as Menelik successfully claimed the throne in 1889.

The Shewan ruler became the dominant personality in Ethiopia and was recognized as Emperor Menelik II by all but Yohannis's son and Ras Alula. During the temporary period of confusion following Yohannis's death, the Italians were able to advance farther into the hinterland from Mitsiwa and establish a foothold in the highlands, from which Menelik was unable to dislodge them. From 1889 until after World War II, Ethiopia was deprived of its maritime frontier and was forced to accept the presence of an ambitious European power on its borders.

Data as of 1991