Once during Great Lent St Dalmatus did not eat any food for the forty days. Later he regained his strength and was found worthy of a divine vision.
When St Isaac was approaching the end of his earthly life, he named St Dalmatus as igumen of the monastery, which later became known as the Dalmatian Monastery.
St Dalmatus showed himself a zealous proponent of the Orthodox Faith at the Third Ecumenical Council at Ephesus (431), which condemned the heresy of Nestorius.
After the Council the holy Fathers elevated St Dalmatus as archimandrite of the Dalmatian monastery, where he died at the age of ninety (after 446).
St Faustus, like his father, was a great ascetic and particularly excelled at fasting. After the death of his father, Faustus became igumen of the monastery."
(taken from the OCA Feasts and Saints for May 30th and August 3rd: http://ocafs.oca.org/FeastSaintsViewer.asp?FSID=102189)
With hymns let us extol Isaacius, Dalmatus, and Faustus as Christ's servants, who shone forth brilliantly in asceticism in the world, and overturned the heresies by faith; for they cry out in behalf of us all.