1137: Theodora III
Byzantine Empress
Born: c.984 AD, Constantinople, Byzantine Empire (Present-day Istanbul, Turkey)
Died: 1056 AD, Constantinople, Byzantine Empire (Present-day Istanbul, Turkey)
Also Known As: Theodora Porphyrogenita
Theodora was the daughter of Constantine VIII.
Theodora spent most of her life in and out of convents and was placed there by her own sister on at least one occasion. Theodora ruled twice in her lifetime, the first time as a co-regent with Zoë and the second time on her own. The second time she ruled, Theodora was around seventy years old.
Very little else of her life story is known.
Sources:
https://www.brooklynmuseum.org/eascfa/dinner_party/heritage_floor/theodora_iii
https://www.britannica.com/biography/Theodora-Byzantine-empress-981-1056