How did the English and Burgundian alliance threaten Charles VII?

The Anglo-Burgundian alliance posed an existential threat to Charles VII by legitimizing English claims to the French throne and fracturing the kingdom’s political unity during the Hundred Years’ War.12

The alliance was solidified following the assassination of John the Fearless, Duke of Burgundy, by the Dauphin’s followers in 1419. Seeking revenge, his successor, Philip the Good, allied with Henry V of England. This partnership led to the Treaty of Troyes in 1420, which formally disinherited Charles VII and recognized the English king as the heir to the French crown.123

This alliance threatened Charles VII in several critical ways:
* Political Legitimacy: It created a "dual monarchy" structure, isolating Charles and forcing him into exile in central France while the English and Burgundians controlled Paris and northern territories.12
* Military Pressure: The combined Anglo-Burgundian forces severely limited Charles’s ability to govern or defend his realm, culminating in the Siege of Orléans in 1428, which threatened to collapse his remaining stronghold.32
* Financial Instability: The loss of major administrative centers and tax bases left Charles struggling to fund his military, forcing him to rely on loans and mortgaging his lands.3