Roger Mortimer, baron of Wigmore, earl of March, the favorite of Isabella, queen consort of Edward II. of England, executed at Smith-field, Nov. 29, 1330. He was convicted of treason in the reign of Edward II. and pardoned, but afterward took part in the rebellion of the earl of Lancaster, and was made prisoner at Boroughbridge in 1322. His life was again spared, and having escaped from the tower, he went to France and entered the service of Charles of Valois. At Paris in 1325 he met Queen Isabella, who had been sent thither by Edward to negotiate a treaty. The queen entered into guilty relations with him, and, having secured the person of her young son, planned with Mortimer and the other leaders of the barons to secure possession of the kingdom. Mortimer went with her to England in 1326. The king was deposed, and his son Edward III. was proclaimed in his stead, and for some years Isabella and her paramour governed the realm in the name of the young prince. A council of regency had been appointed, but Mortimer superseded them all. He procured the death of the dethroned monarch in his prison, and obtained the title of earl of March and valuable confiscated estates.
But the scandal of his life was denounced from the pulpit; the nobles wearied of his arrogance, and Edward finally resolved to take the sceptre into his own hands. While the queen and Mortimer in 1330 were lodged in Nottingham castle during the session of parliament in that town, the king and Lord Montacute with attendants entered by night and carried oif the earl. The king summoned a new parliament to meet him at Westminster, and by it on Nov. 26 Mortimer was condemned as a traitor.