Righteous King Demetrios the Self-Sacrificing of Georgia.
St. Demetrios II, called the Self-Sacrificing, was King of Georgia in the thirteenth century under the domination of the Mongols. When the Mongol khan summoned him under threat of devastating his country, he chose to go, knowing that it meant his death, in order to spare his people.
He was beheaded in 1289 and is honored by the Georgian Church as a righteous king and martyr. His memory is kept on March 12.
Feast day
On the New Calendar, Demetrios of Georgia is commemorated on March 12. Churches on the Old (Julian) Calendar keep the feast on March 25 of the civil calendar.
Also commemorated on March 12

Theophanes the Confessor
Venerable, Θεοφάνης
Venerable Theophanes the Chronographer.
Name days: Theofanis, Theophanis, Theophanes
Gregory the Dialogist
Hierarch, Γρηγόριος ο Διάλογος
Saint Gregory the Dialogist, Pope of Rome, to whom the Presanctified Liturgy is ascribed.
Symeon the New Theologian
Venerable, Συμεών ο Νέος Θεολόγος
Venerable Symeon the New Theologian, mystic and hymnographer of the light of God.
Aaron the Prophet
Prophet, Ααρών
Holy Prophet Aaron, brother of Moses and first high priest of Israel.