)[1] was an Irish Christian bishop and confessor of Inis-Caoin-Deagha (now Inniskeen, County Monaghan), who lived towards the end of the 6th century.
Daig's mother's name was Dediva (also called Editua or Dedi or Deidi or Deighe or Deidiu or Deaga or Mediva), daughter of Tren, son of Dubhthach moccu Lughair, who was Chief Ollam of Ireland and royal poet of King Lóegaire mac Néill.
When a boy he went to the monastery of Devenish Island, County Fermanagh to study under Saint Laisrén mac Nad Froích.
When he graduated he worked as an artisan for Saint Ciarán of Saigir for whom he made 300 bells, 300 croziers and 300 Gospels which were distributed as gifts to other monasteries in Ireland.
The Félire Óengusso ("Martyrology of Óengus"), states "A man of grace for our wheat was Daig, the good and great son of Cairell".