▁The ▁to wers ▁were ▁position ed ▁north - east ▁of ▁the ▁keep ▁and ▁still ▁stand . ▁More ▁work ▁was ▁undert aken ▁between ▁ 1 3 7 0 ▁and ▁ 1 3 7 7 , ▁the ▁year ▁of ▁Edward ' s ▁death . ▁The ▁royal ▁apart ments ▁built ▁during ▁Henry   III ' s ▁reign ▁were ▁never ▁rep a ired ; ▁it ▁has ▁been ▁suggested ▁this ▁was ▁because ▁by ▁the ▁ 1 4 th   century , ▁when ▁considerable ▁sums ▁were ▁being ▁spent ▁on ▁rep airs ▁elsewhere ▁in ▁the ▁castle , ▁Ro chester ▁had ▁fallen ▁out ▁of ▁favour ▁as ▁a ▁royal ▁residence . ▁As ▁the ▁castle ' s ▁importance ▁as ▁a ▁high - status ▁residence ▁w an ed , ▁its ▁role ▁as ▁a ▁bar ra cks ▁and ▁administrative ▁centre ▁came ▁to ▁the ▁fore . ▁The ▁reign ▁of ▁Richard   II ▁( 1 3 7 7 – 1 4 0 0 ) ▁saw ▁the ▁invest ment ▁of ▁£ 5 0 0 ▁in ▁repair ing ▁the ▁castle . ▁This ▁was ▁in ▁part ▁in ▁response ▁to ▁French ▁ra ids ▁on ▁England ' s ▁southern ▁coast ▁during ▁the ▁H undred ▁Years ' ▁War ▁as ▁England ' s ▁fort unes ▁in ▁the ▁conflict ▁w ors ened . ▁The ▁most ▁significant ▁of ▁these ▁works ▁was ▁the ▁construction ▁of ▁a ▁tower ▁at ▁the ▁north ▁end ▁of ▁the ▁castle , ▁over looking ▁the ▁bridge ▁over ▁the ▁Med way . ▁Records ▁document ▁the ▁sum ▁of ▁£ 3 5 0 ▁spent ▁on ▁a ▁new ▁tower ▁between ▁ 1 3 7 8 ▁and ▁ 1