Your Committee finds that the Commons, having at that time considered the appeal above mentioned, approved the proceedings in it, and, as far as in them lay, added the sanction of their accusation against the persons who were the objects of the appeal.  They also, immediately afterwards, impeached all the Judges of the Common Pleas, the Chief Baron of the Exchequer, and other learned and eminent persons, both peers and commoners; upon the conclusion of which impeachments it was that the second claim was entered.  In all the transactions aforesaid the Commons were acting parties; yet neither then nor ever since have they made any objection or protestation, that the rule laid down by the Lords in the beginning of the session of 1388 ought not to be applied to the impeachments of commoners as well as peers.  In many cases they have claimed the benefit of this rule; and in all cases they have acted, and the Peers have determined, upon the same general principles.  The Peers have always supported the same franchises; nor are there any precedents upon the records of Parliament subverting either the general rule or the particular privilege, so far as the same relates either to the course of proceeding or to the rule of law by which the Lords are to judge.

Your Committee observes also, that, in the commissions to the several Lords High Stewards who have been appointed on the trials of peers impeached by the Commons, the proceedings are directed to be had according to the law and custom of the kingdom, and the custom of Parliament:  which words are not to be found in the commissions for trying upon indictments.

“As every court of justice,” says Lord Coke, “hath laws and customs for its direction, some by the Common Law, some by the Civil and Canon Law, some by peculiar laws and customs, &c., so the High Court of Parliament suis propriis legibus et consuetudinibus subsistit.  It is by the Lex et Consuetudo Parliamenti, that all weighty matters in any Parliament moved, concerning the peers of the realm, or Commons in Parliament assembled, ought to be determined, adjudged, and discussed, by the course of the Parliament, and not by the Civil Law, nor yet by the common laws of this realm used in more inferior courts.”  And after founding himself on this very precedent of the 11th of Richard II., he adds, "This is the reason that Judges ought not to give any opinion of a matter of Parliament, because it is not to be decided by the common laws, but secundum Legem et Consuetudinem Parliamenti:  and so the Judges in divers Parliaments have confessed!"[3]

RULE OF PLEADING.