Note 397 — Chapter VI · THE KINGDOM OF SCONE.
Reading edition
Chalmers identifies Laight Alpin with an old ruin in Loch Doon called Laight Castle, founding on a charter by William the Lion to the town of Ayr, which implies that Laight Alpin was on the border between Ayrshire and Galloway; but the name really belongs to the farms of Meikle and Little Laight on the eastern shore of Loch Ryan, and the stone is on the very line of separation between the counties of Ayr and Wigtown.