 The mound may have served several different functions over the ages.The Castle Knowe has been referred to as a fortlet or castle hill and was classed as a motte and bailey in 1974 and records show that a stone rampart was removed in the 1890s for re-use elsewhere.A broad and deep foss or ditch existed that has been obscured as a feature following the Kilruskin Burn's diversion through a covered culvert.