Updated: Sep 18, 2019
The most recent empress in history Empress Zewditu, was religious and conservative and busied herself with building many significant cathedrals towards the end of her reign.
Zewditu (also spelled Zawditu or Zauditu or Zäwditu; Ge'ez: ዘውዲቱ; born Askala Maryam; 29 April 1876 – 2 April 1930) was Empress of Ethiopia from 1916 to 1930. The first female head of an internationally recognized country in Africa in the 19th and 20th centuries, and the first empress regnant of the Ethiopian Empire, her reign was noted for the reforms of her Regent and designated heir Ras Tafari Makonnen (who succeeded her as Emperor Haile Selassie I), about which she was at best ambivalent and often stridently opposed, due to her staunch conservatism and strong religious devotion. She was also the most recent empress regnant in world history.
Source: wikipedia. retrieved from https://en.wikipedia.org/wiki/Zewditu