The murder of John, Duke of Burgundy, by a partisan of the Dauphin, which took place about this time, induced Duke Philip to come to terms with England in the hope of avenging his father’s death;(793) and the French king, finding further resistance hopeless, was content to make peace. By the treaty of Troyes (20 May, 1420), the Dauphin was disinherited in favour of Henry, who was formally recognised as the heir to the French crown, and who agreed to marry Catherine, daughter of Charles VI.(794) The marriage took place on the 3rd June, and on the 14th a solemn procession was made in London and a sermon preached at Paul’s Cross in honour of the event.(795) (M420) (M421) On the 12th July Henry addressed a letter from Mant to the corporation of London informing them of his welfare. He had left Paris for Mant in order to relieve the town of Chartres, which was being threatened by the Dauphin. The Duke of Burgundy had joined him and had proved himself "a trusty, lovvng and faithful brother." The king’s expedition proved unnecessary, for the Dauphin had raised the siege before his arrival and had gone into Touraine. To this letter a reply was sent under the mayoralty seal on the 2nd August, congratulating Henry upon his success, and assuring him that there was no city on earth more peaceful or better governed than his City of London.(796) (M422) On the 26th January, 1421, the Duke of Gloucester, the Guardian of England in the king’s absence, ordered the Sheriffs of London to announce that the queen’s coronation would take place at Westminster on the third Sunday in Lent.(797) The king and queen landed at Dover with a small retinue on the 1st February, and after a few days’ rest at Canterbury, entered the city of London amid tokens of welcome and respect from the laity and clergy. They took up their abode at the Tower, whence they were conducted on the day appointed for the coronation to Westminster by the citizens on foot and on horseback.(798) (M423)