Venerable Hypomone, the former Empress Helen Dragas, mother of the last emperors of Byzantium.
St. Hypomone was born Helen Dragas, daughter of a Serbian prince, and became the wife of the emperor Manuel II Palaiologos and mother of the last two emperors of Byzantium, John VIII and Constantine XI. A woman of deep piety, she was the support of her family through the final years of the empire.
After her husband's death she was tonsured a nun with the name Hypomone, meaning Patience, and lived in the monastery of Kyra Martha in Constantinople until her repose in 1450. Her memory is kept on March 13 and on May 29.
Feast day
On the New Calendar, Hypomone is commemorated on March 13. Churches on the Old (Julian) Calendar keep the feast on March 26 of the civil calendar.
Who celebrates a name day
People with these names keep their name day on this feast:
Ypomoni, Ipomoni, Hypomone, Ypomeni
Also commemorated on March 13

Nikephoros of Constantinople
Hierarch, Νικηφόρος
Patriarch of Constantinople, confessor.
Name days: Nikiforos, Nikiforis, Nicephorus
Africanus, Publius and Terence
Martyr, Αφρικανός
Holy Martyrs Africanus, Publius and Terence of Carthage.
Christina of Persia
Holy Woman, Χριστίνα η εν Περσία
Holy Martyr Christina of Persia, scourged to death for Christ.