King Henry I died in Normandy, leaving no legitimate son. Many leading nobles had previously sworn to accept his daughter, the Empress Matilda, as heir, but support for her was fragile. Henry’s death opened the way for a rapid struggle over the English throne.
Stephen of Blois, Henry I’s nephew, crossed quickly to England and secured the crown with support from key churchmen and nobles. His coronation created a rival claim to Matilda’s, turning a disputed succession into open political conflict. This moment is often treated as the immediate start of the crisis that led into civil war.
In 1138, Scotland’s King David I invaded northern England, partly to press claims connected to Matilda’s cause. Northern English forces defeated the Scots at Cowton Moor near Northallerton, limiting Scottish leverage in the wider conflict. The fighting showed how the disputed English throne could draw in neighboring powers.
Stephen and David I agreed a settlement that reduced immediate pressure on England’s northern frontier. By easing the Scottish threat, Stephen could focus more resources on internal enemies and the coming challenge from Matilda. The treaty reflects how the war’s shape depended on shifting bargains as well as battles.
Matilda arrived in England to challenge Stephen’s rule, transforming political rivalry into sustained armed conflict. She gained support from powerful allies, including her half-brother Robert of Gloucester, and established a base in the west. From this point, control of the kingdom shifted repeatedly through sieges, raids, and local alliances.
Forces loyal to Matilda defeated Stephen’s army at Lincoln and captured the king. Stephen’s imprisonment briefly removed him from power and gave Matilda her best chance to take the throne. The victory also raised the stakes, since both sides now fought not just for influence but for outright rule.
After Stephen’s capture, a church council at Winchester—led by Henry of Blois, bishop of Winchester—recognized Matilda’s authority, styling her “Lady of the English.” This mattered because royal rule depended heavily on church support for legitimacy, administration, and public acceptance. Even with this backing, Matilda still needed to win over key towns and nobles to secure a coronation.
Matilda went to London seeking a coronation, but local resistance and political backlash forced her to withdraw. The failure showed that victory in battle was not enough—urban support and elite consensus were also necessary to rule. This reversal helped Stephen’s supporters regroup around his queen and loyalist commanders.
Fighting at Winchester ended in a major setback for Matilda’s side. Her forces were defeated, and her chief military supporter, Robert of Gloucester, was captured. The result made it possible to negotiate a prisoner exchange that restored Stephen to active rule.
After Robert of Gloucester’s capture, the two sides exchanged high-value prisoners, freeing Stephen. The exchange restarted the war on more equal footing, with neither claimant able to secure lasting control over the kingdom. It also highlighted a pattern of the Anarchy: bargaining and hostage exchanges often shaped outcomes as much as decisive victories.
Stephen besieged Matilda at Oxford, aiming to capture her and end the war. In early December, she escaped—later stories emphasize her white clothing and winter conditions—and reached safety with her supporters. Her escape preserved her faction, but it also marked a shift toward stalemate, with neither side able to eliminate the other.
Stephen’s son and intended heir, Eustace, died suddenly in 1153. His death weakened Stephen’s plans to found a lasting dynasty and reduced resistance to a negotiated settlement. With succession less certain, compromise with Matilda’s son Henry became more realistic.
In 1153, Stephen and Henry (Matilda’s son, often called Henry of Anjou) agreed a settlement commonly known as the Treaty of Wallingford. Stephen would remain king for life, but Henry would inherit the throne, ending the main succession dispute. The treaty is widely treated as the political turning point that brought the civil war toward a close.
Stephen died in 1154, removing the rival king whose claim had divided England since 1135. With the succession settled by treaty, there was no major challenge to the handover of power. His death is often used as the clear endpoint for the civil war’s main phase.
Henry II was crowned at Westminster Abbey, becoming the first Plantagenet king of England. His accession put into effect the 1153 settlement and provided a stable successor after years of contested rule. Rebuilding royal authority—such as dealing with many unauthorized castles raised during the war—became a major task of the new reign.
Anarchy: The civil war of Stephen and Matilda (1135-1154)