. ▁The ▁castle ▁thus ▁revert ed ▁to ▁the ▁crown ▁and ▁was ▁le ased ▁to ▁various ▁ten ants . ▁In ▁ 1 5 5 8 ▁it ▁was ▁acquired ▁by ▁Sir ▁John ▁Per rot , ▁a ▁Lord ▁Deput y ▁of ▁Ireland , ▁who ▁completed ▁the ▁final ▁substantial ▁modifications ▁of ▁the ▁castle . ▁The ▁Elizabeth an ▁plut ocrat ▁re construct ed ▁the ▁north ▁walls ▁to ▁build ▁a ▁long ▁range ▁of ▁domestic ▁rooms . ▁ ▁Dem ise ▁Per rot ▁subsequently ▁fell ▁out ▁of ▁favour ▁and ▁died ▁imprison ed ▁in ▁the ▁Tower ▁of ▁London ▁in ▁ 1 5 9 2 . ▁The ▁castle ▁revert ed ▁to ▁the ▁crown ▁and ▁was ▁finally ▁re - p urch ased ▁by ▁the ▁de ▁Care w ▁family ▁in ▁ 1 6 0 7 . ▁In ▁the ▁Civil ▁War , ▁the ▁castle ▁was ▁ref ort ified ▁by ▁Royal ists ▁although ▁south ▁P embro kes hire ▁was ▁strongly ▁Parliament arian . ▁After ▁changing ▁hands ▁three ▁times , ▁the ▁south ▁wall ▁was ▁pulled ▁down ▁to ▁render ▁the ▁castle ▁in def ens ible ▁to ▁Royal ists . ▁At ▁the ▁Rest oration ▁the ▁castle ▁was ▁returned ▁to ▁the ▁de ▁Care ws , ▁who ▁continued ▁to ▁occup y ▁the ▁eastern ▁wing ▁until ▁ 1 6 8 6 . ▁ ▁The ▁castle ▁was ▁then ▁abandoned ▁and ▁allowed ▁to ▁decay . ▁Much ▁of ▁the ▁structure ▁was ▁lo oted ▁for ▁building ▁stone ▁and ▁for ▁l ime ▁burning . ▁Since ▁ 1 9 8 4 ▁Cad w ▁has ▁fund ed ▁a ▁substantial ▁amount ▁of ▁rest oration ▁performed ▁by ▁the ▁P embro kes hire