Rebellion of 1088

The Rebellion of 1088 occurred after the death of William the Conqueror and concerned the division of lands in the Kingdom of England and the Duchy of Normandy between his two sons William Rufus and Robert Curthose. Hostilities lasted from 3 to 6 months starting around Easter of 1088.

Background
William I on his deathbed in 1087 decided how his sons would inherit the lands of his native Normandy and recently conquered England. His eldest son Robert was made Duke of Normandy and his second eldest William Rufus entitled King of England. This came to pass on William's death. However, for the princes and barons who owned lands in both Normandy and England, it presented a difficult situation of loyalty. The chronicler Orderic Vitalis said of the Norman magnates:


 * What are we to do? Now that our lord is dead, two young men have succeeded and precipitately divided the lordship of England and Normandy. How can we properly serve two lords who are so different and distant from each other? If we serve Robert, Duke of Normandy, worthily, we will offend his brother, William, and we will be stripped by him of our great revenues and large estates in England. On the other hand, if we obey King William fittingly, Duke Robert will deprive us of all our inherited lands in Normandy.

They decided to band together to dispose of young King William II and unite Normandy and England under a single king, the young Duke Robert. The rebels were led by William the Conqueror's half-brothers Odo of Bayeux and Robert, Count of Mortain, with Odo the stronger of the two and the leader behind the plot.

Among the king's initial supporters were all the bishops of England, a few major magnates including Alan Rufus (in the east of England north of London up to Yorkshire), William de Warenne (from Sussex to Yorkshire) and Hugh of Avranches (in the west, around Cheshire), and lesser tenants-in-chief such as Robert Fitzhamon and Walter D'Aincourt. However, the rebels' ranks were made up many of the most powerful barons in England: of the ten largest baronial landholders in the Domesday Book, six were counted amongst the rebels. They were spread far and wide geographically from Kent, controlled by Bishop Odo, to Northumberland, controlled by Robert de Mowbray, to Gloucestershire and Somerset under Geoffrey de Montbray (Bishop of Coutances), to Norfolk with Roger Bigod, Roger of Montgomery at Shrewsbury in Shropshire, and a vast swathe of territory in the south-west, centre and south of England under Count Robert. Also in support of the rebels was Eustace III, Count of Boulogne.

The rebels' strategy was that Odo and the other rebel barons would start the fight in England, while Robert would launch an invasion force from Normandy.

Rebellion of 1088
With the coming of spring in 1088, the barons set out on a campaign to lay waste to the king's lands and supporters. They then activated their own castles, fortified and stocked them with provisions, and waited for a response from the king. If for some reason no response came, they knew they could easily live by plundering neighbouring territories, and thus reduce the kingdom to feudal anarchy, a situation the king would eventually have to address.

The king's response was threefold. First, he divided his enemies by promising those who sided with him that they would receive as much money and land as they wanted. Second, he appealed to the English people as a whole, promising them "the best law that had ever been in this land". This had a positive effect in allowing regional garrisons the support they needed to fight the rebels. Finally, he attacked the rebels personally. In a six-week siege of Pevensey Castle he captured the rebel leader Odo.

In a stroke of luck for the king, the troops Robert was sending from Normandy were driven back by bad weather on the seas. Meanwhile, the king, together with some of his allies took Rochester Castle, and with Robert's failure to arrive, the rebels were forced to surrender and the rebellion was over.

Those of William's barons who had remained loyal urged leniency for the rebel barons, Orderic Vitalis says, addressing the king:


 * ..if you remit your anger against these men [the rebels] and benevolently retain them with you, or at least allow them to depart in peace, you will enjoy the benefits of their friendship and service on many future occasions. It may be that the man who harms you, later obeys you as a friend.

Odo, previously the richest man in England, was stripped of his belongings and banished to Normandy for life, while his brother Robert of Mortain was allowed to stay in England and keep his estates. Roger of Montgomery had left the rebels and joined with the king after promises of land and money. The king pragmatically kept those aristocrats whom he needed and removed those who were a threat.

William de St-Calais, Bishop of Durham, who had abandoned the king's army during the campaign, was tried later in the year, deposed, and exiled to Normandy, but in 1091 returned and was reinstated.