Holy Child-Martyr Gabriel of Bialystok.
Gabriel was a child of a peasant family near Bialystok who, tradition relates, was abducted and killed at the age of six in 1690. His body was found some time later and his relics remained incorrupt.
He is venerated in Poland and Belarus as a protector of children.
Feast day
On the New Calendar, Gabriel of Bialystok is commemorated on April 20. Churches on the Old (Julian) Calendar keep the feast on May 3 of the civil calendar.
Also commemorated on April 20

Zacchaeus the Apostle
Apostle, Ζακχαίος ο Απόστολος
Holy Apostle Zacchaeus, the tax collector of Jericho who received the Lord in his house.
Athanasios of Meteora
Venerable, Αθανάσιος ο Μετεωρίτης
Venerable Athanasios, founder of the Great Meteoron monastery on the rocks of Thessaly.
Martyrs of Nicomedia converted by Saint George
Martyr, Βίκτωρ, Ζωτικός, Ακίνδυνος, Καισάριος, Σεβηριανός, Χριστόφορος, Θεωνάς και Αντωνίνος
Holy Martyrs Victor, Zoticus, Acindynus, Caesarius, Severian, Christopher, Theonas and Antoninus of Nicomedia.
John of the Old Lavra
Venerable, Ιωάννης ο Παλαιολαυρίτης
Venerable John of the Old Lavra of Saint Chariton in Palestine.
Joasaph of Meteora
Venerable, Ιωάσαφ ο Μετεωρίτης
Venerable Joasaph of Meteora, a prince who left his throne for the monastic life.