The most notable part of the Parliamentary Estate is the Palace of Westminster, where the chambers of both houses of Parliament (the Commons and the Lords) are located. The oldest part of the Palace of Westminster is Westminster Hall, the historic core of the building; the present-day Palace of Westminster was built after a major fire in 1834 destroyed all of the palace except for Westminster Hall, the Chapel of St Mary Undercroft, the Cloisters and Chapter House of St Stephen's, and the Jewel Tower. The palace includes two courtyards, the Old Palace Yard and New Palace Yard; the former dates to the time of Edward the Confessor, while the latter was built in 1097 on the orders of William II (Rufus).