Zewditu was Empress of Ethiopia from 1916 until her death in 1930. The first female head of an internationally recognized country in Africa in the 19th and 20th centuries, and the first and only empress regnant of the Ethiopian Empire, her reign was noted for the reforms of her Regent and designated heir Ras Tafari Makonnen, about which she was at best ambivalent and often stridently opposed, due to her staunch conservatism and strong religious devotion. She is the most recent empress regnant, as well as the last female Ethiopian head of state until the 2018 election of Sahle-Work Zewde as president.

The emperor of Ethiopia, also known as the Atse, was the hereditary ruler of the Ethiopian Empire, from at least the 13th century until the abolition of the monarchy in 1975. The emperor was the head of state and head of government, with ultimate executive, judicial and legislative power in that country. A National Geographic article from 1965 called imperial Ethiopia "nominally a constitutional monarchy; in fact [it was] a benevolent autocracy".