▁the ▁Court . ▁Trad itionally , ▁pe ers ▁would ▁wear ▁their ▁parliament ary ▁ro bes ▁during ▁the ▁hear ings . ▁ ▁The ▁hearing ▁res emb les ▁an ▁ordinary ▁trial : ▁both ▁sides ▁may ▁call ▁witness es ▁and ▁present ▁evidence . ▁At ▁the ▁end ▁of ▁the ▁hearing ▁the ▁l ords ▁vote ▁on ▁the ▁ver dict , ▁which ▁is ▁decided ▁by ▁a ▁simple ▁majority , ▁one ▁charge ▁at ▁a ▁time . ▁Upon ▁being ▁called , ▁a ▁peer ▁must ▁rise ▁and ▁declare ▁" gu ilty , ▁upon ▁my ▁honour " ▁or ▁" not ▁guilty , ▁upon ▁my ▁honour ". ▁After ▁voting ▁on ▁all ▁of ▁the ▁articles ▁has ▁taken ▁place , ▁and ▁if ▁the ▁L ords ▁find ▁the ▁def endant ▁guilty , ▁the ▁Commons ▁may ▁move ▁for ▁judgment ; ▁the ▁L ords ▁may ▁not ▁declare ▁the ▁pun ishment ▁until ▁the ▁Commons ▁have ▁so ▁moved . ▁The ▁L ords ▁may ▁then ▁decide ▁whatever ▁pun ishment ▁they ▁find ▁fit , ▁within ▁the ▁law . ▁A ▁royal ▁p ardon ▁cannot ▁exc use ▁the ▁def endant ▁from ▁trial , ▁but ▁a ▁p ardon ▁may ▁repr ieve ▁a ▁conv icted ▁def endant . ▁However , ▁a ▁p ardon ▁cannot ▁override ▁a ▁decision ▁to ▁remove ▁the ▁def endant ▁from ▁the ▁public ▁office ▁they ▁hold . ▁ ▁History ▁ ▁Inst ances ▁of ▁use ▁ ▁Parliament ▁has ▁held ▁the ▁power ▁of ▁im pe achment ▁since ▁medieval ▁times . ▁Origin ally , ▁the ▁House ▁of ▁L ords ▁held ▁that ▁im pe achment ▁could ▁apply ▁only ▁to ▁members ▁of ▁the ▁peer age , ▁as ▁the ▁nob ility