Reivers Riddle

I had so much fun solving the Werewolf and Whitespace puzzles that I've decided to set one up of my own. Living in Carlisle I'd like to capture the history of the notorious Border Reivers and locate the final geocache in a place that has historical associations with them. That shouldn't be too difficult to find as the area is littered with buildings and place names that give clues to the region's turbulent past. Fortified farmhouses, earth works and the division of land into Marches that are still ceremoniously recognised today are all worthy legacies of earlier centuries of lawlessness