Far away below bridge on the right bank of the Thames lay another Royal Palace, that of Greenwich. The Manor of Greenwich belonged to the Crown at an early period. In 1300 Edward I. and the Prince his son made offering "at each of the holy crosses of the Virgin Mary at Greenwich." The estate passed for a time out of Royal hands, but Humphrey, duke of Gloucester, enclosed a park of 200 acres, built a tower known as Greenwich Castle, and the more famous Palace of Placentia, which on his death in 1447 reverted to the Crown, the Palace becoming the favourite abode of the early Tudor sovereigns. It now remains to speak of that grand national monument which, for varied interest, exceeds all its sister buildings in the ancient city--the Tower of London. Stow has well described the various uses which from time to time it has served:--"A citadel to defend or command the city; a royal palace for assemblies or treaties; a prison of State for the most dangerous offenders; the only place of coinage for all England; the armoury for warlike provision; the treasury of the ornaments and jewels of the Crown; and general conserver of the most ancient records of the King's Courts of Justice at Westminster." The Great or White Tower was built at the command of William the Conqueror by Gundulph, Bishop of Rochester, about the year 1078. Much injury was done to the new work by a storm in 1092, and the fortifications were repaired and extended by William Rufus, who, for this purpose and for the erection of Westminster Hall, cruelly oppressed his subjects with taxes. The building of the subsidiary forts and defences appears to have continued during the reigns of Henry I. and most of his successors to the time of Edward I.