Cormac of Mortlach is the third Bishop of Mortlach, Scotland

Scotland

Scotland is a country that is part of the United Kingdom. Occupying the northern third of the island of Great Britain, it shares a border with England to the south and is bounded by the North Sea to the east, the Atlantic Ocean to the north and west, and the North Channel and Irish Sea to the...

, according to the list of the Aberdeen Registrum. He is known only by name. Skene tried to identify him with Bishop Cormac of Dunkeld

Cormac of Dunkeld

Cormac, Bishop of Dunkeld is the earliest recorded Bishop of Dunkeld in the 12th century, although he was not the first bishop of Dunkeld. It is possible, that he was the first bishop of Dunkeld distinct from the abbot, but there is no evidence for this...

, but this argument rests purely on the similarity of an extremely common name. Cormac's successor Nechtan

Nechtan of Aberdeen

Nechtan of Aberdeen is the first Bishop of Aberdeen after the seat of the bishopric had been moved to Aberdeen from Mortlach. The only contemporary sources for Bishop Nechtan are charters; he appears as "Nectan escob Abberdeon" in a Gaelic charter recorded in the notitiae on the Book of Deer, a...

 was bishop by at least 1131, when he appears in a charter recorded in the Gaelic notitiae on the margins of the Book of Deer

Book of Deer

The Book of Deer is a 10th-century Latin Gospel Book from Old Deer, Aberdeenshire, Scotland, with early 12th-century additions in Latin, Old Irish and Scottish Gaelic. It is most famous for containing the earliest surviving Gaelic literature from Scotland...

.