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.
Zoste patrikia Zōstē patrikía (Greek: ) was a Byzantine court title reserved exclusively for the woman who was the chief attendant and assistant to the Empress. A very high title, its holder ranked as the first woman after the Empress herself in the imperial court. The title is attested from the 9th century until the 12th century, but only a handful of its holders are known.