▁wrote ▁two ▁historical ▁nov els ▁set ▁in ▁Wales , ▁O wen ▁Gl end ower ▁( 1 9 4 1 ) ▁and ▁Por ius ▁( 1 9 5 1 ). ▁The ▁first ▁de als ▁with ▁the ▁re bell ion ▁of ▁the ▁Wel sh ▁Prince ▁O wen ▁Gl end ower ▁( A . D . 1 4 0 0 – 1 6 ), ▁while ▁Por ius ▁takes ▁place ▁during ▁the ▁Dark ▁A ges , ▁in ▁A . D . ▁ 4 9 9 , ▁just ▁before ▁the ▁Ang lo - S ax on ▁In vas ion ▁of ▁Britain . ▁Pow ys ▁suggests ▁par alle ls ▁with ▁these ▁historical ▁periods ▁and ▁Britain ▁in ▁the ▁late ▁ 1 9 3 0 s ▁and ▁during ▁World ▁War ▁II . ▁ ▁Other ▁significant ▁British ▁novel ists ▁include ▁Ge or get te ▁He yer , ▁Na omi ▁Mitch ison , ▁and ▁Mary ▁Ren ault . ▁He yer ▁essentially ▁established ▁the ▁historical ▁rom ance ▁genre ▁and ▁its ▁sub gen re ▁Reg ency ▁rom ance , ▁which ▁was ▁inspired ▁by ▁Jane ▁Aust en . ▁To ▁ensure ▁accuracy , ▁He yer ▁collected ▁reference ▁works ▁and ▁kept ▁detailed ▁notes ▁on ▁all ▁aspects ▁of ▁Reg ency ▁life . ▁While ▁some ▁critics ▁thought ▁the ▁nov els ▁were ▁too ▁detailed , ▁others ▁considered ▁the ▁level ▁of ▁detail ▁to ▁be ▁He yer ' s ▁greatest ▁asset ; ▁He yer ▁even ▁re created ▁William ▁the ▁Con quer or ' s ▁crossing ▁into ▁England ▁for ▁her ▁novel ▁The ▁Con quer or . ▁Na omi ▁Mitch ison ' s ▁fin est