of Paris. The intrigues of the French parties culminated in the assassination of John the Fearless, Duke of Burgundy, by Dauphin Charles's partisans at Montereau-Fault-Yonne on 10 September. Philip the Good, the new duke, and the French court threw themselves into Henry's arms. After six months of negotiation, the Treaty of Troyes recognised Henry as the heir and regent of France. On 2 June 1420 at Troyes Cathedral, he married Catherine of Valois, the French king's daughter. They had only one son, Henry, born on 6 December 1421 at Windsor Castle. From June to July 1420, King Henry's army besieged and took the military fortress castle at Montereau-Fault-Yonne close to Paris. He besieged and captured Melun in November 1420, returning to England shortly thereafter. In 1428, Charles VII retook Montereau, to once again see the English take it over within a short time. Finally, on 10 October 1437, Charles VII was victorious in regaining Montereau-Fault-Yonne. While Henry was in England, his brother Thomas, Duke of Clarence, led the English forces in France. On 22 March 1421, Thomas led the English to a disastrous defeat at the Battle of Baugé against a Franco-Scottish army. The duke was killed in the battle. On 10 June, Henry sailed back to France to retrieve the situation. It was to be his last military campaign. From July to August, Henry's forces besieged and captured Dreux, thus relieving allied forces at Chartres. On 6 October, his forces laid siege to Meaux, capturing it on 11 May 1422. Death Henry V died on 31 August 1422 at the Château de Vincennes. The commonly held view is that Henry V contracted dysentery in the period just after the Siege of Meaux, which ended on 9 May 1422. However the symptoms and severity of dysentery present themselves fairly quickly and he seems to have been healthy in the weeks following the siege. At the time speculative causes of his illness also included smallpox, the bacterial infection erysipelas and even leprosy. But there is no doubt he had contracted a serious illness sometime between May and June. Recovering at the castle of Vincennes, by the end of June it seems he was well enough to lead his forces with the intent of engaging the Dauphinist forces at Cosne-sur-Loire. At the outset he would have been riding in full armour, probably in blistering heat, as the summer of 1422 was extremely