Holy Equal-to-the-Apostles Olga, Princess of Kiev, grandmother of St. Vladimir.
St. Olga was the wife of Prince Igor of Kiev and ruled Rus' after his death in the tenth century. She traveled to Constantinople, where she was baptized with the name Helen, and returned to Kiev as the first Christian ruler of her people.
Though her son remained a pagan, her grandson Vladimir would later baptize all of Rus'. She reposed in peace and is honored as Equal-to-the-Apostles.
Feast day
On the New Calendar, Olga of Kiev is commemorated on July 11. Churches on the Old (Julian) Calendar keep the feast on July 24 of the civil calendar.
Who celebrates a name day
People with these names keep their name day on this feast:
Also commemorated on July 11

Sophrony of Essex
Venerable, Σωφρόνιος του Έσσεξ
Venerable Sophrony (Sakharov) of Essex, disciple of St. Silouan the Athonite.
Nektarios of Vryoulla
Martyr, Νεκτάριος ο Νέος
New Monastic Martyr Nektarios of Vryoulla, who suffered in Asia Minor.
Nikodemos of Elbasan
Martyr, Νικόδημος ο εξ Ελβασάν
New Monastic Martyr Nikodemos of Elbasan in Albania.
Nikodemos of Vatopedi
Venerable, Νικόδημος ο Βατοπεδινός
Venerable Nikodemos of Vatopedi, spiritual father of St. Gregory Palamas.