Passage: 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.In 1295 Westminster was the venue for the Model Parliament, the first English representative assembly, summoned by Edward I; during his reign he called sixteen parliaments, which sat either in the Painted Chamber or the White Chamber. By 1332 the barons (representing the titled classes) and burgesses and citizens (representing the commons) began to meet separately, and by 1377 the two bodies were entirely detached. In 1512 a fire destroyed part of the royal palace complex and Henry VIII moved the royal residence to the nearby Palace of Whitehall, although Westminster still retained its status as a royal palace. In 1547 Henry's son, Edward VI, provided St Stephen's Chapel for the Commons to use as their debating chamber. The House of Lords met in the medieval hall of the Queen's Chamber, before moving to the Lesser Hall in 1801. Over the three centuries from 1547 the palace was enlarged and altered, becoming a warren of wooden passages and stairways.St Stephen's Chapel remained largely unchanged until 1692 when Sir Christopher Wren, at the time the Master of the King's Works, was instructed to make structural alterations. He lowered the roof, removed the stained glass windows, put in a new floor and covered the original gothic architecture with wood panelling. He also added galleries...

Question: What class did the barons represent?
the titled classes