ance ▁Survey ▁Name ▁Books ▁in ▁the ▁mid - 1 8 0 0 s ▁record ▁the ▁structure ▁as ▁" one ▁of ▁the ▁ancient ▁fe ud al ▁resid ences ▁ere cted ▁for ▁the ▁protection ▁of ▁the ▁ ▁B orders . ▁It ▁was ▁square ▁in ▁appearance ". ▁ ▁A ▁series ▁of ▁these ▁pe el ▁to wers ▁was ▁built ▁in ▁the ▁ 1 5 th ▁century ▁along ▁the ▁Twe ed ▁valley ▁from ▁its ▁source ▁to ▁Ber wick , ▁as ▁early - warning ▁be a cons ▁announ cing ▁invasion ▁from ▁the ▁March es . ▁ ▁Rom ano - B rit ish ▁S ett lement ▁A ▁sc oop ed ▁hom est ead , ▁meas uring ▁ 2 6 x 2 3 ▁meters ▁internally , ▁is ▁situated ▁on ▁the ▁ste ep ▁SW ▁face ▁of ▁Pur vis ▁Hill , ▁approximately ▁ 2 0 0 ▁meters ▁north ▁of ▁The ▁Kir na . ▁The ▁en clos ing ▁wall ▁has ▁been ▁largely ▁lost , ▁but ▁the ▁position ▁of ▁the ▁entrance ▁is ▁still ▁visible . ▁Within ▁the ▁walls ▁is ▁a ▁platform ▁large ▁enough ▁to ▁support ▁two ▁tim ber ▁houses . ▁ ▁Kir nie ▁C ott age ▁ ▁It ▁is ▁believed ▁that ▁the ▁c ott age , ▁locally ▁known ▁as ▁Kir nie ▁C ott age , ▁situated ▁just ▁outside ▁and ▁to ▁the ▁west ▁of ▁the ▁boundary ▁wall ▁of ▁The ▁Kir na ▁on ▁the ▁A 7 2 ▁was ▁the ▁she ph erd ' s ▁c ott age ▁for ▁Pir n ▁House ▁( dem ol ished ▁in ▁early ▁ 1 9 5 0 s ) ▁built ▁by ▁St