Gregory the Righteous of Decapolis

Reading from the Synaxarion:

Saint Gregory who was from Irenopolis of the Decapolis of Asia Minor,
was the son of Sergius and Mary. He became a monk as a young man, and
after struggling for many years in virtue and prayer under obedience to
a wise spiritual father, he was informed by revelation that it was
the will of God for him to live, like the Patriarch Abraham, with no
certain dwelling, moving from place to place. His journeyings took him to
Ephesus, Constantinople, Corinth, Rome, Sicily, Thessalonica, and again to
Constantinople, where, after many labours in defence of Orthodoxy against
Iconoclasm, he reposed in peace in the first half of the ninth century. He
had two disciples, one of whom was Saint Joseph the Hymnographer (see
Apr. 3), who wrote the Menaion service for Saint Gregory, his father
in Christ.

Kontakion in the Third Tone
The Church knoweth thee to be a shining sun that enlight'neth all men
with the rays of cures and with the beauty of virtue. Hence, O truly
blessed Father, Christ's faithful servant, we all celebrate thy venerable
memorial, O wise Gregory most righteous; and we now honour thy valiant
struggles for Christ.