, is allegedly depicted in the foreground with
Queen Isabella in this 14th-century manuscript illustration Mortimer was appointed
Lord Lieutenant of Ireland on 23 November 1316 and left for Ireland with a large force in February 1317. While there, he fought against the Scots Army led by
Edward Bruce, the younger brother of
Robert the Bruce (who hoped to make Edward king of Ireland), and Bruce's Norman-Irish allies, the
de Lacy's. Joan accompanied her husband to Ireland. They returned to England in 1318 after Mortimer had driven the Scots north to
Carrickfergus, and dispersed the de Lacys, who were Joan's relatives. For the next few years, Mortimer occupied himself with baronial disputes on the Welsh border; nevertheless, on account of the increasing influence of
Hugh Despenser, the Elder, and
Hugh Despenser the Younger over
King Edward II, Mortimer became strongly disaffected with his monarch, especially after the younger Despenser had been granted lands which rightfully belonged to Mortimer. In October 1321 King Edward and his troops besieged
Leeds Castle, after the
governor's wife,
Margaret de Clare, Baroness Badlesmere, refused Queen Isabella admittance and subsequently ordered her archers to fire upon Isabella and her escort after the latter attempted to gain entry to the castle.
Elizabeth, the third Badlesmere daughter, was married to Joan and Mortimer's eldest son,
Edmund Mortimer. King Edward exploited his new popularity in the wake of his military victory at Leeds Castle to recall to England the Despensers, whom the
Lords Ordainers, led by
Thomas, 2nd Earl of Lancaster, had forced him to banish in August 1321. The Marcher lords, already in a state of insurrection for some time prior to the Despensers' banishment, immediately rose up against the King in full force, with Mortimer leading the confederation alongside Ordainer
Humphrey de Bohun, 4th Earl of Hereford. The King quelled the rebellion, which is also known as the
Despenser War. Mortimer and his uncle
Roger Mortimer de Chirk both surrendered to him at
Shrewsbury on 22 January 1322. Mortimer and his uncle were dispatched as prisoners to the
Tower of London, It was there that he later became the lover of Queen Isabella, who was estranged from the King as a result of the Despensers' absolute control over him. She had been sent to France on a peace mission by Edward but used the occasion to seek support from her brother,
Charles IV to oust the Despensers. The scandal of their love affair forced them to leave the French court for
Flanders, where they obtained help for an
invasion of England.
Joan's imprisonment ,
Yorkshire, where Joan was imprisoned from 1324 to 1326 While the couple were still in France, King Edward had retaliated against Mortimer by taking Joan and all of their children into custody, and "treating them with severity". In April 1324 Joan was removed from Hampshire where she had been confined in a lodging under house arrest and sent to
Skipton Castle in
Yorkshire where she was imprisoned in a cell and endured considerable suffering and hardship. Most of her household had been dismissed and she was permitted only a small number of attendants to serve her. She was granted just one
mark per day for her necessities, and out of this sum she also had to feed her servants. Her daughters suffered worse privations having been locked up inside various religious houses with even less money at their disposal. Joan was transferred from Skipton to
Pontefract Castle in July 1326.
Countess of March Mortimer and Isabella landed in England two months later in September 1326, and they joined forces with
Henry, 3rd Earl of Lancaster. On 16 November, King Edward was taken prisoner and eventually murdered at
Berkeley Castle, presumably by Mortimer's hired assassins. From 1327 to 1330, Mortimer and Isabella jointly held the Office of
Regent for her son, King
Edward III who was duly crowned following his father's death. Mortimer was made constable of
Wallingford Castle; in September 1328, Mortimer was created
Earl of March. This made Joan henceforth, the
Countess of March; although it is not known what she thought about her husband's illegal assumption of power and affair with the Queen. What has been established is that Joan was never an active participant in her husband's insurrection against King Edward. Mortimer and Queen Isabella were the
de facto rulers of England. Hostility against the power Mortimer wielded over the kingdom and the young King Edward III, increased and his former friend Henry of Lancaster encouraged the King to assert his authority to oust Mortimer. When Mortimer ordered the execution of
Edmund, Earl of Kent, half-brother of the late King Edward, anger and outrage engulfed the country. The King deposed his mother and her lover. Mortimer was seized, arrested, and on 29 November 1330,
hanged at
Tyburn, London. Following her husband's execution, Joan – as the wife of a traitor – was imprisoned again, this time in
Hampshire where years before she had been placed under house arrest; her children were also taken into custody. In 1331, she was given an allowance for household expenses; however, her lands were only restored to her in 1336 after King Edward III granted her a full pardon for her late husband's crimes. The majority of the remaining family lands and honours were restored to her grandson
Roger Mortimer, 2nd Earl of March. ==Death==