Farnham's part in a 'forgotten' civil war and a warrior bishop...
- gilldavid560
- Feb 24
- 4 min read
When people think of Magna Carta, they tend to imagine a foundational moment of English liberty — a timeless constitutional landmark. But as historian Dan Jones has pointed out, Magna Carta began life as something far more fragile: a flimsy peace treaty hastily agreed between a deeply unpopular king and his rebellious barons. Within weeks, it lay in tatters.
King John repudiated the charter almost immediately. England slid into civil war.
What followed, between 1215 and 1217, is one of the least appreciated crises in English history — a moment when the English crown came perilously close to passing into foreign hands. And at the heart of this struggle stood Farnham Castle.
The Barons’ War and a French Pretender
John’s enemies did something extraordinary. Frustrated with broken promises and royal tyranny, the rebel barons invited Louis, son of the French king, to take the English throne.
When Louis landed in England on 21 May 1216, he was not treated as an invader. London welcomed him. English magnates swore allegiance. At its height, his army may have numbered as many as 35,000 men. Much of the south and east of England — including London, Winchester, and most of East Anglia — fell under his control. England was fractured.
A Child King and a Master Regent
King John’s death from dysentery in October 1216 should have sealed England’s fate. His heir, Henry III, was just nine years old. Vast swathes of the realm were occupied by Louis. Royal authority was hanging by a thread.
Yet John’s final decision proved inspired. He placed the kingdom in the hands of William Marshal, widely praised by contemporary Archbishop Stephen Langton as “the best knight that ever lived.” A seasoned warrior, diplomat, and statesman, William Marshal, by now a man in his 70s, transformed the conflict.
This struggle was no longer about an unloved tyrant clinging to power. It became a fight to defend the crown of an innocent child.
The Warrior Bishop
The Bishop of Winchester, Peter des Roches had continued to serve John faithfully for the remainder of his reign. During the period of mounting baronial opposition to the king, Pope Innocent III instructed Peter des Roches and his royal colleagues to support King John against the rebels, whom he termed "worse than Saracens, for they are trying to depose a king who, would succour the Holy Land.”
Upon John’s death Peter oversaw the accession of Henry III in 1216 at the age of nine, and he personally crowned the young king. In fact, his most famous military achievements came on behalf of Henry III during the French invasion. The History of William Marshal provides some of the best evidence for Peter des Roches’s military actions on behalf of John and Henry III. At the Siege of Torksey William Marshal 'entrusted his crossbowmen to Peter, the worthy bishop of Winchester, who was in charge of leading them, who had sound knowledge in that sphere, and who strove hard to perform well.’
In a later battle, probably the great royalist victory at Lincoln, Peter was described as playing an even greater and more personal role. The author praised his knightly feats, writing,
The worthy bishop of Winchester, Peter des Roches, who was in charge that day of advising our side, was not slow or slothful, and he knew how to make use of his arms. In the company of his fine troop of men he gave chase, and in the course of that pursuit he did very well indeed, capturing knights as he went.
Winchester, the Diocese of War
The Diocese of Winchester in fact became the principal theatre of military operations in 1217. Winchester itself changed hands repeatedly. The outskirts backed the rebels, while within the city walls the locals remained loyal to Henry. The Bishop's Wolvesey Palace fell quickly. Hyde Abbey suffered damage. Only Winchester Cathedral escaped serious harm.
Within this volatile landscape, Farnham Castle emerged as a crucial strategic stronghold.
Its position on the western approaches to London, combined with its administrative and military importance, made it indispensable to both sides.
The Siege of Farnham Castle, March 1217
In March 1217, Farnham Castle was held by French troops loyal to Prince Louis. On 7 March, William Marshal and the young King Henry III personally laid siege to the fortress.
For six tense days, the castle held out. Then the French garrison surrendered.
The fall of Farnham was a significant morale boost for the royalists and demonstrated that Louis’s grip on England was not unbreakable. But the victory proved fragile. Louis soon returned from France, retaking both Farnham and Winchester with alarming speed.
Still, the tide was turning.
From the Siege of Farnham to Peace at Lambeth
Later in 1217, decisive royalist victories elsewhere — particularly at Lincoln and at sea off Sandwich — broke Louis’s momentum. The dream of a 'French England' collapsed.
In September 1217, the Treaty of Lambeth formally ended the war. Louis renounced all claims to the English throne and returned home. The treaty also included the stipulation that the agreement confirmed the Magna Carta, a significant moment in the development of English political democracy.
The Final Years
William Marshall came to distrust Peter des Roches and rejected the latter's claim to be regent after his death, and instead entrusted Henry to the care of Pandulf, the Papal legate, continuing 'Sire, I pray God that if I have ever done anything pleasing to Him, He will give you the grace to be a gentleman. If it should happen that you follow the example of some evil ancestor, I pray God not to grant you a long life.'
Peter des Roches, controversial Bishop of Winchester and a key political player throughout the conflict, would continue to shape royal government for decades to come.
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