Raeberry Castle's chosen position tells you something about the people who built it. They wanted a place that could not be stormed. The promontory is barely a stack - an oval of rock rising perhaps ninety feet above the sea, with cliffs falling sheer on three sides. The only way onto the site is across a narrow neck of land from the landward side, and that neck was cut by at least three defensive ditches. The innermost was about fifteen metres wide and four metres deep, adapted from a natural gully and almost certainly reinforced with a stone wall. Standing on the headland, with the wind off the Solway and the cliffs vanishing under your feet, the strategy is obvious. Take this place by sea? Impossible. By land? You have to fight your way through three ditches and a wall to get to where the men with the bows are waiting.

The Old Norse derivation of the name is not certain, but it is plausible. Raudr berg or raudabiorg - 'red rock' or 'red headland' - would refer to the reddish tint of the local stone, which may be due to its iron content or to the presence of Old Red Sandstone found elsewhere on this coast. Historians have speculated that Norse settlers may have originally fortified the site during their rule over Galloway in the eleventh century, though no archaeological evidence has yet confirmed it. What is certain is that this stretch of coast had a deep Norse imprint. The place names alone - Hestan Island, Borgue, Kirkandrews - tell the story of a community that for several generations was Gaelic-speaking only in its second language.

By the medieval period the headland had become the principal seat of Clan MacLellan, one of the great Galloway families. The MacLellans of Bombie - Bombie is the parish just north of the site - held lands and offices throughout the Stewartry. Raeberry was their fortress, the place they could not be evicted from. In 1452, during the brutal Douglas-Crown wars that consumed Scotland in that decade, the castle was besieged by William Douglas, 8th Earl of Douglas. Sir Patrick MacLellan, who held the place, was captured and taken to Threave Castle - the Douglas stronghold on an island in the River Dee. What happened to him afterwards has been disputed by historians, but his line continued. The Raeberry siege of 1452 is the last time the castle appears in the historical record.

Two other features sit within walking distance of the vanished tower. About a kilometre to the east lies St Margaret's Well of Kirkcudbright, a spring traditionally associated with healing and Christian devotion - the kind of small holy place that survived from pre-Christian water-cult into the medieval religious landscape. Nearby on Raeberry Hill stands Wallace's Putting Stone, a Neolithic stone circle believed to be part of a prehistoric ritual landscape. People were gathering on this headland thousands of years before the MacLellans planted their castle on it. The well and the stones are reminders that fortified sites are usually the latest layer on land that has had spiritual significance for far longer.

By the late nineteenth century, only faint traces remained. The antiquarian F. R. Coles described remnants of lime and stone along the eastern edge of the promontory, ramparts at either end, and two bold entrenchments inland. A later trackway - probably built to make stone-robbing easier - crosses the innermost ditch via a rough causeway. The interior is overgrown now with bracken and grass; shallow depressions and low mounds suggest the footprints of structures or the trenches of earlier excavations. It is not a tourist site. There are no signs, no ticket booth, no carved interpretation panels. You walk out onto the headland with the wind doing what it does, and you have to imagine the rest - the hall, the stairs, the men on the rampart watching the Solway for sails. It is a place that asks something of you, and gives back only what you bring.