The title Baron Mortimer of Wigmore was created twice in the Peerage of England

Peerage of England

The Peerage of England comprises all peerages created in the Kingdom of England before the Act of Union in 1707. In that year, the Peerages of England and Scotland were replaced by one Peerage of Great Britain....

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The first time, Edmund Mortimer was summoned to parliament on 23 June 1295. The second baron, who was created Earl of March in 1328, was attainted in 1330 and the barony as well as the earldom was forfeited.

The second time, it was created as a re-grant; The son of the 1st Earl of March, Edmund de Mortimer, was summoned to parliament on 20 November 1331. The second baron of this creation became Earl of March in 1354 upon the reversal of the attainder. The two titles then merged. The barony either merged in crown in 1461 or became extinct in 1425.

Barons Mortimer of Wigmore (1295–1330)

• Edmund de Mortimer, 1st Baron Mortimer (d. 1304)
• Roger Mortimer 2nd Baron Mortimer (d. 1330) attainted & forfeit 1330

Barons Mortimer of Wigmore (1331)

• Edmund Mortimer, 1st Baron Mortimer (c.1306–1331)
• Roger Mortimer 2nd Baron Mortimer (1328–1360)
• for further barons look at Earl of March
  Earl of March
  The title The Earl of March has been created several times in the Peerage of Scotland and the Peerage of England. The title derived from the "marches" or boundaries between England and either Wales or Scotland , and was held by several great feudal families which owned lands in those border...
  
   (English Peerage
  Peerage of England
  The Peerage of England comprises all peerages created in the Kingdom of England before the Act of Union in 1707. In that year, the Peerages of England and Scotland were replaced by one Peerage of Great Britain....
  
  , creation of 1328)