Fergus of Galloway was King, or Lord, of Galloway from an unknown date (probably in the 1110s), until his death in 1161. He was the founder of that "sub-kingdom," the ressurector of the Bishopric of Whithorn, the patron of new abbeys (e.g. Dundrennan Abbey), and much else besides. He became a legend after his death, although his actual life is clouded in mystery.

Fergus’ later years were mired by the squabbling of his two sons. Perhaps too, Fergus’ longevity was testing his sons’ patience. Walter Daniel reported that, in relation to the mid-1150s, Fergus was:
“… incensed against his sons, and the sons raging against the father and each other … The King of Scotland could not subdue, nor the bishop pacify their mutual hatreds, rancour and tyranny. Sons were against father, father against sons, brother against brother, daily polluting the unhappy little land with bloodshed.” (Walter Daniel, ‘‘Life of Ailred’’, 45-6; quoted in Oram, pp. 78-9)

Whether because of Gilla Brigte and Uchtred, or because of Máel Coluim’s campaigns, Fergus was forced into retirement, becoming a monk at Holyrood Abbey in 1160. He died the following year.