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A fortification has existed on the site from Saxon times. But the current ruin is of Norman origin, a great square stone tower was built by Geoffrey de Clinton, Treasurer and Chief Justice of England to Henry I, in about 1125. Henry II took control of the castle during the rebellion of 1173- 1174, giving the Clintons another castle in Buckinghamshire by way of compensation.

Henry II began work on improving the defensive qualities of the castle. Work continued during the reign of Henry III which turned the castle into one of the strongest in the Midlands. The properties of water defences had long been known but at Kenilworth a great lake was created to defend three sides of the castle. Covering over 100 acres (0.4 km²) it was an expensive endeavour, but the value in keeping siege engines further away and as a barrier to assault or mining was immense.

However after all the work to improve the castle Henry III gifted it in 1244Events Sultan Malik al-Muattam razes city walls. Births Deaths March 1 Gruffydd ap Llywelyn, eldest, illegitimate son of Llywelyn the Great (b. 1200) Monarchs/Presidents Aragon James I King of Aragon and count of Barcelona (reigned from 1213 to 1276) Cast to Simon de MontfortThis article discusses Simon de Montfort the son, who achieved prominence in English history. For the father, who figured in French history as one of the leaders of the crusade against the Albigensians, see Simon de Montfort, 5th Earl of Leicester. Simon, Earl of Leicester. Simon de Montfort became a leader in the Barons' War ( 1263Events Detmold, Germany was founded. Mindaugas, the first and only Christian king of Lithuania, is assassinated by his cousin Treniota. Balliol College, Oxford was founded. The chieftains of the eastern part of Iceland become the last to pledge fealty to- 1267Events Roger Bacon's Opus Majus Mongol built its Grand Capital in Beijing Births Emperor Go-Uda of Japan Deaths Monarchs/Presidents Aragon James I King of Aragon and count of Barcelona (reigned from 1213 to 1276) 1267.) against Henry III, Kenilworth was the centre of his operations and Lord Edward, Henry's heir, was briefly imprisoned at Kenilworth before escaping. De Montfort was killed in battle near Evesham on August 4August 4 is the 216th day of the year in the Gregorian Calendar (217th in leap years), with 149 days remaining. Events 1500-1899 1578 Battle of Al Kasr al Kebir Moroccans defeat Portuguese. King Sebastian of Portugal is defeated and killed in North Africa 1265Events January 20 In Westminster, the first English parliament conducts its first meeting. Fire destroys parts of Old Cairo. Battle of Evesham August 4 Births Alfonso III of Aragon Emperor Fushimi of Japan May 14 Dante Alighieri, Italian poet. Deaths Simo facing Lord Edward. In 1266Events February 26 French defeat Germans and Sicilians at Battle of Benevento. Dictum of Kenilworth issued. Treaty of Perth gives Western Isles to Scotland. Prince Koreyasu succeeds Prince Munetaka as shogun in Japan. Births Beatrice Portinari, Dante Alig, the rebels under the leadership of Henry de Hastings , used the castle as a refuge when Lord Edward surrounded Kenilworth. The siege of Kenilworth Castle in 1266Events February 26 French defeat Germans and Sicilians at Battle of Benevento. Dictum of Kenilworth issued. Treaty of Perth gives Western Isles to Scotland. Prince Koreyasu succeeds Prince Munetaka as shogun in Japan. Births Beatrice Portinari, Dante Alig is the longest in English history at almost a year. The extensive water defences proved their worth, despite Edward targeting the weaker north wall, defended by only a double moat, employing huge siege towers and even attempting a night attack by barge. The siege was ended on easy terms for the defenders with the Dictum of Kenilworth. The experience gained in water defenses at Kenilworth was put to good effect at later castles built in Wales, notably Caerphilly.

From 1364 John of Gaunt began the castle's conversion from a pure fortress into something more liveable, work that continued with his grandson, Henry V. The castle remained in royal hands until it was given to John Dudley in 1553, following his execution Elizabeth I gave it to her favourite Robert Dudley, Earl of Leicester in 1563. Dudley further transformed the castle to suit the tastes of Elizabeth, adding the Leicester building, a large apartment and a residential block overlooking the lake. Elizabeth was expensively and lavishly entertained at Kenilworth for a month in 1575. The castle returned to the Crown on Dudley's death.

Sequoiadendron giganteum ( Giant Sequoia) at Kenilworth Castle

In 1600 Charles II gave the castle to Sir Edward Hyde, whom he created Baron Kenilworth and Earl of Clarendon. The great water defences were destroyed in 1656. The castle remained the property of the Clarendons until 1937 before passing into the possession of Sir John Siddeley, later Lord Kenilworth. The family presented the castle to Kenilworth in 1958. English Heritage has looked after the castle since 1984.