Menz in the context of Semien Shewa Zone (Amhara)

The Zemene Mesafint (Ge'ez: ዘመነ መሳፍንት) variously translated "Era of Judges", "Era of the Princes," "Age of Princes," etc.; taken from the biblical Book of Judges) was a period in Ethiopian history between the mid-18th and mid-19th centuries when the country was de facto divided within itself into several regions with no effective central authority. It was a period in which the Emperors from the Solomonic dynasty were reduced to little more than figureheads confined to the capital city of Gondar. For the most part, the regional lords were tightly related by marriage and constituted a stable ruling elite that prevailed until the mid 20th century. The period also saw the weakening of Ethiopian territorial integrity in the north with the encroachment of the Ottoman Empire in the Ethiopian-Ottoman border conflict along with a renewal of diplomatic relations with Christian Europe after the isolationist Gondarine period and the expansion of the Shewan kingdom into the territory of the southern Oromo.

The most powerful lords during the Zemene Mesafint were Ras Mikael Sehul of Tigre and later the Warra Seh Dynasty who included Ras Ali I, Ras Aligaz, Ras Gugsa and Ras Ali II based in Yejju, a region in Wollo. The most powerful lords such as Ras Ali and Ras Gugsa were members of the Warra Sheikh (or Warra Seh), a dynasty that were made up of former Muslims from Wollo. Other regional lords included Kenfu Hailu of Gondar, Ras Hailu Yosedeq of Gojjam, Sabagadis Woldu of Tigre, Ras Wolde Selassie of Tigre, Wube Haile Mariam of Simien, Ras Dullu of Menz and provincial king Sahle Selassie of Shewa.

Shewa (Amharic: ሸዋ; Oromo: Shawaa; Somali: Shawa; Arabic: شيوا, Italian: Scioà), formerly romanized as Shua, Shoa, Showa, Shuwa, is a historical region of Ethiopia which was formerly an autonomous kingdom within the Ethiopian Empire. The modern Ethiopian capital Addis Ababa is located at its center.

The towns of Debre Berhan, Antsokia, Ankober, Entoto and, after Shewa became a province of Ethiopia, Addis Ababa have all served as the capital of Shewa at various times. Most of northern Shewa, made up of the districts of Menz, Tegulet, Yifat, Menjar and Bulga, is populated by Christian Amharas, while southern Shewa is inhabited by the Gurages and eastern Shewa has large Oromo and Argobba Muslim populations. The monastery of Debre Libanos, founded by Saint Tekle Haymanot, is located in the ancient district of Selale. Modern Shewa includes the historical Endagabatan province.