Venerable Isaakios, Dalmatos and Faustos, ascetics of the Dalmatos Monastery in Constantinople.
Saint Isaakios was the monk who boldly rebuked the Arian emperor Valens and later founded a monastery in Constantinople. Dalmatos, a former officer of the imperial guard, became his disciple and successor, and Dalmatos' son Faustos followed him as abbot.
The monastery, later called the Dalmatos Monastery, became one of the most important in the capital, and its founders are honoured together on this day.
Feast day
On the New Calendar, Dalmatos, Faustos and Isaakios is commemorated on August 3. Churches on the Old (Julian) Calendar keep the feast on August 16 of the civil calendar.
Also commemorated on August 3

Salome the Myrrhbearer
Holy Woman, Σαλώμη η Μυροφόρος
Holy Myrrhbearer Salome, mother of the Apostles James and John.
Theodora of Aegina and Theopiste
Holy Woman, Θεοδώρα και Θεοπίστη
Venerable Theodora of Aegina and her daughter Theopiste, nuns in Thessaloniki.
Anthony the Roman of Novgorod
Venerable, Αντώνιος ο Ρωμαίος
Venerable Anthony the Roman, wonderworker and founder of a monastery at Novgorod.
Theoklito the Wonderworker
Holy Woman, Θεοκλητώ
Venerable Theoklito the Wonderworker, a married woman of great charity.