Origin of the Earls of Lancaster
After the supporters of Henry III of England suppressed opposition from the English nobility in the Second Barons' War, Henry granted to his second son Edmund Crouchback the titles and possessions forfeited by attainder of the barons' leader, Simon de Montfort, 6th Earl of Leicester, including the Earldom of Leicester, on 26 October 1265. Later grants included the first Earldom of Lancaster on 30 June 1267 and that of Earl Ferrers in 1301. Edmund was also Count of Champagne and Brie from 1276 by right of his wife. Henry IV of England would later use his descent from Edmund to legitimise his claim to the throne, even making the spurious claim that Edmund was the elder son of Henry but had been passed over as king because of his deformity.
of Edmund Crouchback
Edmund's second marriage to Blanche of Artois, the widow of the King of Navarre, placed him at the centre of the European aristocracy. Blanche's daughter Joan I of Navarre was queen regnant of Navarre and through her marriage to Philip IV of France was queen consort of France. Edmund's son Thomas became the most powerful nobleman in England, gaining the Earldoms of Lincoln and Salisbury through marriage to the heiress of Henry de Lacy, 3rd Earl of Lincoln. His income was £11,000 per annum—double that of the next wealthiest earl.
Thomas and his younger brother Henry served in the coronation of their cousin King Edward II of England on 25 February 1308; Thomas carried Curtana, the Sword of Mercy, and Henry carried the royal sceptre. After initially supporting Edward, Thomas became one of the Lords Ordainers, who demanded the banishment of Piers Gaveston and the governance of the realm by a baronial council. After Gaveston was captured, Thomas took the lead in his trial and execution at Warwick in 1312. Edward's authority was weakened by poor governance and defeat by the Scots at the Battle of Bannockburn. This allowed Thomas to restrain Edward's power by republishing the Ordinances of 1311. Following this achievement Thomas took little part in the governance of the realm and instead retreated to Pontefract Castle. This allowed Edward to regroup and re-arm, leading to a fragile peace in August 1318 with the Treaty of Leake. In 1321 Edward's rule again collapsed into civil war. Thomas raised a northern army but was defeated and captured at the Battle of Boroughbridge in March 1322. He was sentenced to be hanged, drawn and quartered but because he was Edward's cousin he was given a quicker death by beheading.
Henry joined the revolt of Edward's wife Isabella of France and Mortimer in 1326, pursuing and capturing Edward at Neath in South Wales. Following Edward's deposition at the Parliament of Kenilworth in 1326 and reputed murder at Berkeley Castle, Thomas's conviction was posthumously reversed and Henry regained possession of the Earldoms of Lancaster, Derby, Salisbury and Lincoln that had been forfeit for Thomas's treason. His restored prestige led to him knighting the young King Edward III of England before his coronation. Mortimer lost support over the Treaty of Edinburgh–Northampton that formalised Scotland's independence, and his developing power in the Welsh Marches provoked jealousy from the barons. When Mortimer called a parliament to make his new powers and estates permanent with the title of Earl of March in 1328, Henry led the opposition and held a counter-meeting. In response, Mortimer ravaged the lands of Lancaster and checked the revolt. Edward III was able to assume control in 1330 but Henry's further influence was restricted by poor health and blindness for the last fifteen years of his life.