Treaty of Troyes
In May 1420, the Treaty of Troyes was signed in the cathedral between Henry V of England, his ally Philip of Burgundy and Queen Isabel, wife of the mad Charles VI of France whereby the throne of France would pass to Henry on the death of Charles rather than to Charles' son the Dauphin. Henry married Catherine of Valois, the French king's daughter, shortly afterwards in Troyes, either at the cathedral or the church of St Jean.