Roger Mortimer, 1st Earl of March

Definition and stakes

Under One Sceptre, or Mortimer's Mission…

Amid solemn pomp and glittering funeral gloom, the coffin of the heir of England was borne over St. George's Channel to his ancestral home at Wigmore. There they laid him with the elder Mortimers, and not, like his father, with his Montacute ancestors, at Bisham. There, by the side of the valiant and wise Edmund Mortimer and his royally descended Margaret, who may be termed the founders of the house, by the first Earl of darkened memory, by the young and royal mother whom he could barely remember, sleeps Roger Mortimer, heir presumptive of England, first and last Lollard of the House of March.
Source: Gutenberg

James Endell Tyler Henry of Monmouth, Volume 1

The custody of the Earl of March and his brother was given to the Prince of Wales on February 1st, 1409; and, since he had received nothing for their sustentation, an assignment of five hundred marks a year was made to him from the duties of skins and wool. On the 3rd of July, the King granted to him "the manors belonging to Edmund, son and heir of Roger Mortimer, Earl of March," during the young man's minority. The Prince's revenues seem to have been scanty in the extreme, and his father had recourse to many of the various modes of raising money usually adopted in those days.
Source: Gutenberg

Ronald John McNeill 1911 Encyclopædia Britannica (1911)

The daughters all married into powerful families, chiefly of Marcher houses. His eldest son, Edmund, was father of Roger Mortimer (c. 1328–1360) , who was knighted by Edward III. in 1346, and restored to his grandfather’s title as 2nd earl of March.
Edmund de Mortimer (1351–1381) , 3rd earl of March, was son of Roger, 2nd earl of March, by his wife Philippa, daughter of William Montacute, 1st earl of Salisbury. Being an infant at the death of his father, Edmund, as a ward of the crown, was placed by Edward III. under the care of William of Wykeham and Richard Fitzalan, earl of Arundel.
Source: Wikisource

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