<P> At the south end of the Chamber are the ornate gold Canopy and Throne; although the Sovereign may theoretically occupy the Throne during any sitting, he or she attends only the State Opening of Parliament . Other members of the Royal Family who attend the State Opening use Chairs of State next to the Throne, and peers' sons are always entitled to sit on the steps of the Throne . In front of the Throne is the Woolsack, an armless red cushion stuffed with wool, representing the historical importance of the wool trade, and used by the officer presiding over the House (the Lord Speaker since 2006, but historically the Lord Chancellor or a deputy). The House's mace, which represents royal authority, is placed on the back of the Woolsack . In front of the Woolsack is the Judges' Woolsack, a larger red cushion that used to be occupied during the State Opening by the Law Lords (who were members of the House of Lords), and prospectively by the Supreme Court Justices and other Judges (whether or not members), to represent the Judicial Branch of Government . The Table of the House, at which the clerks sit, is in front . </P> <P> Members of the House occupy red benches on three sides of the Chamber . The benches on the Lord Speaker's right form the Spiritual Side and those to his left form the Temporal Side . The Lords Spiritual (archbishops and bishops of the established Church of England) all occupy the Spiritual Side . The Lords Temporal (nobles) sit according to party affiliation: members of the Government party sit on the Spiritual Side, while those of the Opposition sit on the Temporal Side . Some peers, who have no party affiliation, sit on the benches in the middle of the House opposite the Woolsack; they are accordingly known as crossbenchers . </P> <P> The Lords Chamber is the site of nationally televised ceremonies, the most important of which is the State Opening of Parliament, which is held formally to open each annual parliamentary session, either after a General Election or in the autumn . At this occasion every constitutional element of the government is represented: the Crown (both literally, and figuratively in the person of the Sovereign), The Lords Spiritual and Temporal, and The Commons, (who together form the Legislature), the Judiciary (although no judges are members of either House of Parliament), and the Executive (both Government Ministers, and ceremonial military units in attendance on the Sovereign); and a large number of guests are invited to attend in the large Royal Gallery immediately outside the Chamber . The Sovereign, seated on the Throne, delivers the Speech from the Throne, outlining the Government's programme for the year and legislative agenda for the forthcoming parliamentary session . The Commons may not enter the Lords' debating floor; instead, they watch the proceedings from beyond the Bar of the House, just inside the door . A small purely formal ceremony is held to end each parliamentary session, when the Sovereign is merely represented by a group of Lords Commissioners . </P> <P> Following the Blitz, which destroyed the chamber of the House of Commons, the Lord's chamber was occupied by the Commons . The Lords temporarily used the Robing Room during the reconstruction . The State Opening Of Parliament was carried out as normal, with the new rooms being used . Evidence can still be seen of this today, with damage clearly visible on one of the doors where they were struck by Black Rod . </P>

When did the houses of parliament get built