▁many ▁historical ▁episodes ▁in ▁British ▁history . ▁Given ▁the ▁proxim ity ▁of ▁Carl is le ▁to ▁the ▁border ▁between ▁England ▁and ▁Scotland , ▁it ▁has ▁been ▁the ▁centre ▁of ▁many ▁wars ▁and ▁invas ions . ▁Today ▁the ▁castle ▁is ▁managed ▁by ▁English ▁Heritage ▁and ▁is ▁open ▁to ▁the ▁public . ▁ ▁Until ▁recently ▁the ▁castle ▁was ▁the ▁administrative ▁headquarters ▁of ▁the ▁former ▁King ' s ▁O wn ▁Royal ▁Border ▁Regiment . ▁It ▁is ▁now ▁the ▁county ▁headquarters ▁to ▁the ▁Duke ▁of ▁Lanc aster ' s ▁Regiment ▁and ▁a ▁museum ▁to ▁the ▁regiment ▁is ▁within ▁the ▁castle ▁walls . ▁ ▁History ▁Carl is le ▁Castle ▁was ▁first ▁built ▁during ▁the ▁reign ▁of ▁William ▁II ▁of ▁England , ▁the ▁son ▁of ▁William ▁the ▁Con quer or ▁who ▁inv aded ▁England ▁in ▁ 1 0 6 6 . ▁At ▁that ▁time , ▁C umber land ▁( the ▁original ▁name ▁for ▁north ▁and ▁west ▁C umb ria ) ▁was ▁still ▁considered ▁a ▁part ▁of ▁Scotland . ▁William ▁II ▁ordered ▁the ▁construction ▁of ▁a ▁Norman ▁style ▁mot te ▁and ▁ba iley ▁castle ▁in ▁Carl is le ▁on ▁the ▁site ▁of ▁the ▁old ▁Roman ▁ ▁fort ▁of ▁L ug u val ium , ▁dated ▁by ▁d end ro chron ology ▁to ▁ 7 2 AD , ▁with ▁the ▁castle ▁construction ▁beginning ▁in ▁ 1 0 9 3 . ▁ ▁The ▁need ▁for ▁a ▁castle ▁in ▁Carl is le ▁was ▁to ▁keep ▁the ▁northern ▁border ▁of ▁England ▁secured ▁against ▁the ▁threat ▁of ▁invasion ▁from ▁Scotland . ▁In ▁ 1 1