When was the sister of Theodora Porphyrogenita died who was reigned as Byzantine Empress alongside her sister?
Zoë Porphyrogenita Zoë ( "life" ] ; 978 – June 1050) reigned as Byzantine Empress alongside her sister Theodora from April 19 to June 11, 1042. She was also enthroned as the Empress Consort to a series of co-rulers beginning with Romanos III in 1028 until her death in 1050 while married to Constantine IX.
Anna Palaiologina (daughter of Michael IX) Anna Palaiologina (Greek: Ἅννα Παλαιολογίνα ) was a Byzantine princess and queen-consort ("basilissa") of the Despotate of Epirus.