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.
Grand Duchess Olga Alexandrovna of Russia Grand Duchess Olga Alexandrovna of Russia (Russian: О́льга Алекса́ндровна ; 13 June [O.S. 1 June] 1882 – 24 November 1960) was the youngest child and younger daughter of Emperor Alexander III of Russia and younger sister of Emperor Nicholas II.