William’s Response and the French Intervention

• Furious at Matilda’s secret support for Robert, William immediately moved to suppress the rebellion, launching a swift attack on Rémalard, driving the rebels out of their refuge.
• However, King Philip I of France, seeking to weaken Norman influence, provided Robert and his followers with the castle at Gerberoi, strengthening their position.
• New supporters began to flock to Robert’s banner, escalating the conflict into a full-scale war.

Consequences and Legacy

• Robert’s rebellion revealed deep divisions within William’s dynasty, especially between father and son.
• The involvement of Flanders and France foreshadowed future conflicts between Normandy and the Capetian monarchy.
• Though this first rebellion failed, it was only the beginning of Robert’s lifelong struggle against his father and later his brothers, which would ultimately lead to the absorption of Normandy by England.

The rebellion of 1077–1079 marked Robert Curthose’s first real challenge to William the Conqueror, setting the stage for decades of internal strife within the Norman dynasty.