In 1250 the King sent for the principal citizens, and assured them that he would no longer oppress them by taxation. This promise was never meant to be kept. On a frivolous complaint of Richard, the King’s brother, the City liberties were seized and a _custos_ appointed, who remained in office until the City had paid a fine of six hundred marks. Five hundred more were demanded for a new charter by which the incoming Mayor might be presented to the Barons of the Exchequer every year instead of the King. The old jealousy with which the citizens looked upon the Tower was about this time revived and strengthened by the erection of a wall round the Tower. Longchamp had made the ditch, but his work remained incomplete. Henry resolved to carry it on and to make an independent fortress surrounded by its own walls and having its own communications with the river and the country outside. The citizens looked upon the rise of this wall with suspicion and misgiving. Before the work was completed the wall fell down. It was put up again, and again it fell down, to the great joy of the people, who looked upon it as a direct intervention of Heaven on their behalf. That this was really the case was proved by a story which ran about the City that the overthrow of the wall was done by St. Thomas à Becket himself. “A vision appeared by night to a certain priest, a wise and holy man, wherein an archprelate, dressed in pontifical robes, and carrying a cross in his hand, came to the walls which the King had at that time built near the Tower of London, and, after regarding them with a scowling look, struck them strongly and violently with the cross, saying, ‘Why do ye rebuild them?’ Whereupon the newly-erected walls suddenly fell to the ground, as if thrown down by an earthquake. The priest, frightened at this sight, said to a clerk who appeared following the archprelate, ‘Who is this archbishop?’ to which the clerk replied, ‘It is St. Thomas the martyr, a Londoner by birth, who considered that these walls were built as an insult, and to the prejudice of the Londoners, and has therefore irreparably destroyed them.’ The priest then said, ‘What expense and builders’ labour have they not cost.’ The clerk replied,‘If poor artificers, who seek after and have need of pay, had obtained food for themselves by the work, that would be endurable; but inasmuch as they have been built, not for the defence of the kingdom, but only to oppress harmless citizens, if St. Thomas had not destroyed them, St. Edmund the Confessor and his successor would still more relentlessly have overthrown them from their foundations.’ The priest, after having seen these things, awoke from his sleep, rose from his bed, and in the dead silence of the night told his vision to all who were in the house. Early in the morning a report spread through the city of London that the walls built round the Tower, on the construction of which the King had expended more than