Henry, 3rd Earl of Lancaster

Henry of Lancaster
Earl of Lancaster and Leicester
Later arms of Henry of Lancaster: The royal arms of King Henry III a label France of three points
Earl of Lancaster and Leicester
Predecessor	Thomas, 2nd Earl
Successor	Henry of Grosmont, 4th Earl, later 1st Duke of Lancaster
Born	c. 1281
Died	22 September 1345(1345-09-22) (aged c. 63–64) Leicester Castle
Spouse	Maud Chaworth
Issue	Henry of Grosmont, 1st Duke of Lancaster Blanche of Lancaster, Baroness Wake of Liddell Maud of Lancaster, Countess of Ulster Joan of Lancaster, Baroness Mowbray Isabel of Lancaster, Prioress of Amesbury Eleanor of Lancaster, Countess of Arundel Mary of Lancaster, Baroness Percy
House	Plantagenet
Father	Edmund Crouchback, 1st Earl of Lancaster
Mother	Blanche of Artois

Henry, 3rd Earl of Leicester and Lancaster (c. 1281 – 22 September 1345) was a grandson of King Henry III (1216-1272) of England and was one of the principals behind the deposition of King Edward II (1307-1327), his first cousin.

He was the younger son of Edmund Crouchback, 1st Earl of Lancaster, Earl of Leicester, a son of King Henry III by his wife Eleanor of Provence. Henry's mother was Blanche of Artois, Queen Dowager of Navarre.

Henry's elder brother Thomas, 2nd Earl of Lancaster, succeeded their father in 1296, but Henry was summoned to Parliament on 6 February 1298/99 by writ directed to Henrico de Lancastre nepoti Regis ("Henry of Lancaster, nephew of the king", Edward I), by which he is held to have become Baron Lancaster. He took part in the Siege of Caerlaverock in July 1300.

After a period of longstanding opposition to King Edward II and his advisors, including joining two open rebellions, Henry's brother Thomas was convicted of treason, executed and had his lands and titles forfeited in 1322. Henry did not participate in his brother's rebellions; he later petitioned for his brother's lands and titles, and on 29 March 1324 he was invested as Earl of Leicester. A few years later, shortly after his accession in 1327, the young Edward III of England returned the earldom of Lancaster to him, along with other lordships such as that of Bowland.

On the Queen's return to England in September 1326 with Roger Mortimer, 1st Earl of March, Henry joined her party against King Edward II, which led to a general desertion of the king's cause and overturned the power of Hugh le Despenser, 1st Earl of Winchester, and his namesake son Hugh the younger Despenser.