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.
Theodora Angelina (daughter of Isaac Komnenos) Theodora Angelina was the only daughter of Anna Angelina and the "sebastocrator" Isaac Comnenus. Her maternal grandparents were Byzantine emperor Alexius III Angelus and Euphrosyne Doukaina Kamaterina.