Ceremonial maces in the United Kingdom carried by the Yeoman Usher of the Black Rod and placed behind the Lord Speaker on the Woolsack before the House sits. All members are required to bow their heads to the mace upon entering the chamber. It is absent when the monarch delivers his or her speech from the throne at State Openings of Parliament. The other mace accompanies the Lord Chancellor on official duties outside the House of Lords. Mace A was made in the reign of Charles II , is long and weighs . Mace B was made in the reign of William III and Mary II
Judicial functions of the House of Lords the Crown. The last impeachment trials were the Impeachment of Warren Hastings from 1788 to 1795 and the Impeachment of Viscount Melville in 1806. The novel "Clouds of Witness" (1926) by Dorothy L. Sayers depicts in the House of Lords the fictional trial of a duke who is accused of murder. Sayers researched and used the then current trial procedures. "Kind Hearts and Coronets" (1949) comedy from Ealing Studios features an almost identical scene. Disputes involving peerage claims were normally referred by the Crown to the House of Lords, perhaps because hereditary peers were, prior to the House of Lords