Should you wish to know who ‘Ronald’ is (although he’s a bit of a latecomer in TMA terms:
The next important personage to appear in Galloway history is Ronald the Dane, titular King of Northumbria, styled also Duke of the Glaswegians, in right of the ancient superiority of the Saxon kings over the Picts.
With Olaf of the Brogues (Anlaf Cuaran), grandson of Olaf the White, as his lieutenant, he drove the Saxons before him as far south as Tamworth. This was in 937, but in 944 the tide of victory rolled north again. King Eadmund drove Ronald out of Northumbria to take refuge in Galloway. Of this province he and his sons continued rulers till the close of the tenth century.
‘A History of Dumfries and Galloway’ by Herbert Maxwell (1896).
Also I noticed that the cairn is on the side of ‘Crotteagh Hill’ – this could come from ‘cruiteach’, meaning lumpy and uneven (spotted in ‘Studies in the topography of Galloway’, also by Sir Maxwell, 1887).