Before being raised to the bishopric by King David I of Scotland, he was the abbot of Dunkeld.
[1] King David entrusted certain lands to Gregory, who was to hold them until there were canons on the island of St. Colme's Inch, a charge accomplished before 1169.
The lands so entrusted included the island itself, “Kincarnathar” (probably Nether Kincairney), and Donibristle.
[2] Gregory appears in a great number of charters dating to the reigns of David I and Máel Coluim IV of Scotland, the earliest of which may date to 1135, although 1146 is the first firm date, when he appears alongside Bishop Andreas of Caithness in the Gaelic notitiae on the Book of Deer.
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