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
Crown Jewels of the United Kingdom ceremonial objects carried by sergeants-at-arms and now represent a monarch's authority. The House of Commons can only operate lawfully when the royal mace – dating from the reign of Charles II – is present at the table. Two other maces dating from the reigns of Charles II and William III are used by the House of Lords: One is placed on the Woolsack before the house meets and is absent when a monarch is there in person. In the late 17th century, there were 16 maces, but only 13 survive, 10 of which are on display at the Tower of