▁P ole , ▁Count ess ▁of ▁Sal is bury ▁( 1 4 ▁August ▁ 1 4 7 3   – ▁ 2 7 ▁May ▁ 1 5 4 1 ), ▁was ▁an ▁English ▁peer ess . ▁She ▁was ▁the ▁daughter ▁of ▁George , ▁Duke ▁of ▁Clar ence , ▁the ▁brother ▁of ▁k ings ▁Edward ▁IV ▁and ▁Richard ▁III . ▁Margaret ▁was ▁one ▁of ▁two ▁women ▁in ▁ 1 6 th - century ▁England ▁to ▁be ▁a ▁peer ess ▁in ▁her ▁own ▁right ▁with ▁no ▁titled ▁husband . ▁One ▁of ▁the ▁few ▁surv iving ▁members ▁of ▁the ▁Plant agen et ▁dynast y ▁after ▁the ▁Wars ▁of ▁the ▁Ros es , ▁she ▁was ▁executed ▁in ▁ 1 5 4 1 ▁at ▁the ▁command ▁of ▁Henry ▁VIII , ▁who ▁was ▁the ▁son ▁of ▁her ▁first ▁cousin ▁Elizabeth ▁of ▁York . ▁Pope ▁Leo ▁XIII ▁beat ified ▁her ▁as ▁a ▁mart yr ▁for ▁the ▁Catholic ▁Church ▁on ▁ 2 9 ▁December ▁ 1 8 8 6 . ▁ ▁Early ▁life ▁Margaret ▁was ▁born ▁at ▁Far le igh ▁Hung er ford ▁Castle ▁in ▁Som erset , ▁the ▁only ▁surv iving ▁daughter ▁of ▁George ▁Plant agen et , ▁ 1 st ▁Duke ▁of ▁Clar ence , ▁and ▁his ▁wife ▁Isabel ▁Ne ville , ▁who ▁was ▁the ▁elder ▁daughter ▁of ▁Richard ▁Ne ville , ▁ 1 6 th ▁Earl ▁of ▁War wick , ▁and ▁his ▁wife ▁Anne ▁de ▁Be auch amp , ▁ 1 6 th ▁Count ess ▁of ▁War wick . ▁Her ▁mat ernal ▁grand father ▁was ▁killed ▁fighting ▁against