▁York shire . ▁He ▁was ▁defeated ▁and ▁killed ▁in ▁ 1 4 8 5 ▁at ▁the ▁Battle ▁of ▁Bos worth ▁by ▁Henry ▁T ud or , ▁who ▁succeeded ▁him ▁as ▁Henry ▁VII . ▁The ▁new ▁king ▁married ▁Margaret ' s ▁cousin ▁Elizabeth ▁of ▁York , ▁Edward ▁IV ' s ▁daughter , ▁and ▁Margaret ▁and ▁her ▁brother ▁were ▁taken ▁into ▁their ▁care . ▁So on ▁young ▁Edward , ▁a ▁potential ▁York ▁claim ant ▁to ▁the ▁throne , ▁was ▁moved ▁to ▁the ▁Tower ▁of ▁London . ▁Edward ▁was ▁briefly ▁displayed ▁in ▁public ▁at ▁St ▁Paul ' s ▁C athedral ▁in ▁ 1 4 8 7 ▁in ▁response ▁to ▁the ▁presentation ▁of ▁the ▁imp ost or ▁Lam bert ▁Sim nel ▁as ▁the ▁" E ar l ▁of ▁War wick " ▁to ▁the ▁Irish ▁l ords . ▁Short ly ▁there after , ▁probably ▁in ▁November ▁ 1 4 8 7 , ▁Henry ▁VII ▁gave ▁Margaret ▁in ▁marriage ▁to ▁his ▁cousin , ▁Sir ▁Richard ▁P ole , ▁whose ▁mother ▁was ▁half - s ister ▁of ▁the ▁king ' s ▁mother , ▁Margaret ▁Beau fort . ▁When ▁Per kin ▁War beck ▁imp erson ated ▁Edward ▁IV ' s ▁pres umed - de ad ▁son ▁Richard ▁of ▁Sh rew s bury , ▁ 1 st ▁Duke ▁of ▁York , ▁in ▁ 1 4 9 9 , ▁Margaret ' s ▁brother ▁Edward ▁was ▁att aint ed ▁and ▁executed ▁for ▁invol vement ▁in ▁the ▁plot . ▁Richard ▁P ole ▁held ▁a ▁variety ▁of ▁offices ▁in ▁Henry ▁VII ' s ▁government , ▁the