Also this grant and confirmation we have made to the citizens of London for the amendment of the said city, and because it was in ancient times farmed for three hundred pounds: wherefore we will and steadfastly command, that the citizens of London and their heirs may have and hold the sheriffwick of London and Middlesex, with all things to the said sheriffwick belonging, of us and our heirs, to possess and enjoy hereditarily, freely and quietly, honourably and wholly, by fee-farm of three hundred pounds; and we forbid that none presume to do any damage, impediment or diminishment to the citizens of London of these things, which to the said sheriffwick do or were accustomed to appertain: Also we will and command, that if we or our heirs, or any of our justices, shall give or grant to any person any of those things which to the farm of the sheriffwick appertain, the same shall be accounted to the citizens of London, in the acquittal of the said farm at our exchequer. LONDON BRIDGE (1202). It is possible that there was a London Bridge in Roman times, and there certainly was one, built of wood, before the Conquest. The modern structure was finished in 1831, and this replaced the old bridge, which was built between 1176 and 1209, about 200 feet east of the present one. It consisted of twenty arches, a drawbridge for large vessels, and a chapel and crypt in the centre, dedicated to St. Thomas of Canterbury. It was afterwards covered with houses and shops on both sides, like a street. The last of these buildings was removed in 1757. The following letter was written by King John to the citizens of London during the construction of the bridge, and shows that the erection and maintenance of this important means of communication was a matter for royal and national, as well as local, consideration. =Source.=—Document quoted by Maitland, vol. i., p. 45. John, by the Grace of God, King of England, etc. To his faithful and beloved the Mayor and Citizens of London, greeting.