Holy Father Theoctistus and his fellow struggler Euthymius the Great
Saint Theoctistus, a monk at the Palestinian lavra of Pharan, embraced a more severe life in the wilderness with his friend Saint Euthymius the Great. They founded a monastery, of which Theoctistus was the abbot. He reposed in deep old age in 451.
Kontakion of Righteous Theoctistus and Euthymius in the Plagal of the Fourth Tone
Thou didst preserve the dignity of thy soul free of every stain, which as God's creature, thou wholly didst dedicate unto the Lord, O righteous one; and divinely enlightened, thou didst rise to the pinnacle of true godliness, O godly Theoctistus, confirming thy name in very deed.