When was the sister of Theodora Porphyrogenita died who was reigned as Byzantine Empress alongside her sister?
Theodora Porphyrogenita (11th century) Theodora Porphyrogenita (Greek: Θεοδώρα, "Theodōra" ; AD 980 – 31 August 1056) was a Byzantine Empress born into the Macedonian dynasty that had ruled the Byzantine Empire for almost two hundred years. She was co-empress with her sister Zoë for two months in 1042 and sole empress regnant from 11 January 1055 to 31 August 1056. She was the last of the Macedonian line, and upon her death the empire entered a period of decline that lasted until the ascension of Alexios I Komnenos in 1081.
Athanasia of Aegina Saint Athanasia of Aegina (born circa 790 in Aegina - died 14 August 860, Timia, Greece) was a saint who lived in the Byzantine Empire and was for a while adviser to the Empress Theodora II.