The origins of the Anarchy lay in a succession crisis involving England and Normandy. Įarly 14th-century depiction of Henry I and the sinking of the White Ship off Barfleur in Normandy in 1120. Victorian historians coined the term 'the Anarchy' because of the widespread chaos, although modern historians have questioned its accuracy and some contemporary accounts. Chroniclers stated that 'Christ and his saints were asleep' during the period. The conflict was considered particularly destructive, even by the standards of medieval warfare. Henry was crowned as Henry II, the first Angevin king of England, then began a long period of reconstruction.

Over the following year, Stephen began to reassert his authority over the whole kingdom, but died of disease in 1154. The resulting Treaty of Wallingford allowed Stephen to retain the throne but recognised Henry as his successor. Stephen and Henry began peace negotiations, during which Eustace died of illness, removing Stephen's immediate heir. After limited campaigning the two armies faced each other at the siege of Wallingford, but the church brokered a truce, thereby preventing a pitched battle. Henry FitzEmpress re-invaded England in 1153, but neither faction's forces were keen to fight. By the early 1150s most barons and the Church were war weary so favoured negotiating a long-term peace. In 1152 Stephen attempted to have his eldest son, Eustace, as the next king of England recognised by the Catholic Church, but the Church refused to do so. In 1148 the Empress returned to Normandy, leaving the campaigning in England to her young son Henry FitzEmpress. Rebel barons began to acquire ever greater power in northern England and in East Anglia, with widespread devastation in the regions of major fighting. Empress Matilda's husband, Geoffrey V of Anjou, conquered Normandy in her name during 1143, but in England neither side could achieve victory. Stephen then almost captured Matilda in 1142 during the siege of Oxford, but the Empress escaped from Oxford Castle across the frozen River Thames to safety. The two sides agreed to a prisoner exchange, swapping the captives Stephen and Robert. When she attempted to be crowned queen, Empress Matilda was forced to retreat from London by hostile crowds shortly afterwards, Robert of Gloucester was captured at the rout of Winchester. In 1141 Stephen was captured following the Battle of Lincoln, causing a collapse in his authority over most of the country. Armies mostly consisted of armoured knights and footsoldiers, many of them mercenaries. The castles of the period were easily defensible, so the fighting was mostly attrition warfare comprising sieges, raiding and skirmishing. Much of the rest of the country was held by barons who refused to support either side. In the initial years of civil war, neither side was able to achieve a decisive advantage the Empress came to control the south-west of England and much of the Thames Valley, while Stephen remained in control of the south-east. Following a major rebellion in the south-west of England, Matilda invaded in 1139 with the help of her half-brother Robert of Gloucester. Stephen's early reign saw fierce fighting with disloyal English barons, rebellious Welsh leaders, and Scottish invaders. On Henry's death in 1135, his nephew Stephen of Blois seized the throne, with the help of Stephen's brother Henry of Blois, who was the Bishop of Winchester. Henry sought to be succeeded by his daughter, known as Empress Matilda, but was only partially successful in convincing the nobility to support her. The conflict was a war of succession precipitated by the accidental death of William Adelin, the only legitimate son of King Henry I, who drowned in the sinking of the White Ship in 1120. The Anarchy was a civil war in England and Normandy between 11, which resulted in a widespread breakdown in law and order.

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