The Palace of Westminster originally dates from the early eleventh century when Canute the Great built his royal residence on the north side of the River Thames. Successive kings added to the complex: Edward the Confessor built Westminster Abbey; William the Conqueror began building a new palace; his son, William Rufus, continued the process, which included Westminster Hall, started in 1097; Henry III built new buildings for the Exchequer—the taxation and revenue gathering department of the country—in 1270 and the Court of Common Pleas, along with the Court of King's Bench and Court of Chancery. By 1245 the King's throne was present in the palace, which signified that the building was at the centre of English royal administration.