常任上訴法官
The Lords' judicial functions originated from the ancient role of the Curia Regis as a body that addressed the petitions of the King's subjects. The functions were exercised not by the whole House, but by a committee of "Law Lords". The bulk of the House's judicial business was conducted by the twelve Lords of Appeal in Ordinary, who were specifically appointed for this purpose under the Appellate Jurisdiction Act 1876.