He was the son of Henry III, King of England and Eleanor of Provence. He married, firstly, Eleanor de Castilla, Comtesse de Ponthieu, daughter of Fernando III, Rey de Castilla y León and Jeanne d'Aumale, Comtesse de Ponthieu, on 18 October 1254 in Abbey of Las Huelgas, Burgos, Castile, Spain. He married, secondly, Marguerite de France, daughter of Philippe III, Roi de France and Marie de Brabant, on 10 September 1299 in Canterbury Cathedral, Canterbury, Kent, England.
He gained the title of Duke of Gascony in 1254. He was created 1st Earl of Chester [England] on 14 February 1253/54. He fought in the Battle of Lewes on 14 May 1264, where he was taken priosner by the rebellious barons. On 24 December 1264 he was forced the deliver the Earldom of Chester into the hands of Simon de Montfort, Earl of Leicester, but received it back on 4 August 1265 on the death of Simon. He succeeded to the title of King Edward I of England on 20 November 1272. He was crowned King of England on 19 August 1274 in Westminster Abbey, Westminster, London, and styled 'Rex Angliae, Dominus Hiberniae et Dux Aquitaniae.'
He towered over his contemporaries - he was the then rare height of six feet two inches. He was on a Crusade at the time of his accession and returned to England in 1274. Reigning for 35 years he was a strong and wise King. He married Eleanor of Castille and, after her death Margaret, daughter of Phillip III of France. Edward had 16 children by Eleanor and three by Margaret, the most of any Monarch. He carried out much needed reform and clarification of the law. Starting in 1277 he set out to resolve the Welsh problem which had proved so troublesome in Henry III's reign. The area around Snowdon and Anglesy harboured Llewelyn and other warlike princes. Llewelyn was killed in battle and the Welsh resistance collapsed. The Statute of Wales in 1284 arranged for administration under a mixed English and Welsh law. Castles were built to secure the Principality, including Caernarvon where Edward's son (Edward) was born and who was created Prince of Wales in 1301. During his campaign in Wales, it was found that the long bow used by the Southern Welsh, was an amazingly effective weapon which would revolutionise forthcoming conflicts. Edward next marched on Scotland and won a crushing victory at Falkirk but Robert Bruce arose and made himself King of Scotland. Although known as The Hammer of the Scots, Edward had not succeeded in subjugating that noble land. Edward may be best remembered by the Model Parliament called in 1295. He has an extensive biographical entry in the Dictionary of National Biography.