It is likely that the White Castle was first settled by the ancestors of the Votadini tribe, whose main eastern capital was Dunpender, due north.
The hillfort was excavated over four years between 2010 and 2013 by Murray Cook and David Connolly of Rampart Scotland http://www.rampartscotland.co.uk/, and dates to the second half of the 1st millennium BC, though there was also evidence of limited Neolithic and Early Bronze Age activity.