Baron Monthermer
Baron Monthermer is in Baronies of England Alphabetically, Baronies of England Chronologically, Succeeded Baronesses of England.
1st: Ralph Monthermer 1st Baron Monthermer. Died 1325. Son.
2nd: Thomas Monthermer 2nd Baron Monthermer. Died 1340. Daughter.
3rd: Margaret Monthermer Baroness Montagu 3rd Baroness Monthermer. Died 1395. Son.
4th: John Montagu 3rd Earl Salisbury. Died 1400. Son.
5th: Thomas Montagu 1st Count Perche 4th Earl Salisbury. Died 1428. Daughter.
6th: Alice Montagu 5th Countess of Salisbury. Died 1462. Son.
7th: Richard "Kingmaker" Neville Earl Warwick, 6th Earl Salisbury. Died 1471.
On 04 Mar 1309 Ralph Monthermer 1st Baron Monthermer (age 39) was created 1st Baron Monthermer by writ of summons.
Around 1313 Ralph Monthermer 1st Baron Monthermer (age 43) and Isabel Despencer Baroness Hastings and Bergavenny were married. She by marriage Baroness Monthermer. She the daughter of Hugh "Elder" Despencer 1st Earl Winchester (age 51) and Isabella Beauchamp Baroness Monthermer. She a great x 5 granddaughter of King Henry I "Beauclerc" England. 
On 05 Apr 1325 Ralph Monthermer 1st Baron Monthermer (age 55) died. Earl Gloucester, Earl Hertford extinct. His son Thomas Monthermer 2nd Baron Monthermer (age 23) succeeded 2nd Baron Monthermer.
Before 1340 Thomas Monthermer 2nd Baron Monthermer (age 38) and Margaret Brewes Baroness Monthermer were married. She by marriage Baroness Monthermer. She the daughter of Peter Brewes Count Flanders. He the son of Ralph Monthermer 1st Baron Monthermer and Joan of Acre Countess Gloucester and Hertford. He a grandson of King Edward "Longshanks" I of England. 
On 24 Jun 1340 King Edward III of England (age 27) attacked the French fleet at anchor during the Battle of Sluys capturing more than 200 ships, killing around 18000 French. The English force included John Beauchamp 1st Baron Beauchamp Warwick (age 24), William Bohun 1st Earl of Northampton (age 30), Henry Scrope 1st Baron Scrope Masham (age 27), William Latimer 4th Baron Latimer of Corby (age 10), John Lisle 2nd Baron Lisle (age 22), Ralph Stafford 1st Earl Stafford (age 38), Henry of Grosmont 1st Duke Lancaster (age 30), Walter Manny 1st Baron Manny (age 30), Hugh Despencer 1st Baron Despencer (age 32) and Richard Pembridge (age 20).
Thomas Monthermer 2nd Baron Monthermer (age 38) died from wounds. His daughter Margaret Monthermer Baroness Montagu 3rd Baroness Monthermer succeeded 3rd Baroness Monthermer.
Before 1350 John Montagu 1st Baron Montagu, Baron Monthermer (age 20) and Margaret Monthermer Baroness Montagu 3rd Baroness Monthermer were married. She by marriage Baroness Montagu. He by marriage Baron Monthermer. He the son of William Montagu 1st Earl Salisbury and Catherine Grandison Countess of Salisbury. She a great granddaughter of King Edward "Longshanks" I of England. 
In 1395 Margaret Monthermer Baroness Montagu 3rd Baroness Monthermer died. In 1395 Her son John Montagu 3rd Earl Salisbury (age 45) succeeded 4th Baron Monthermer. Maud Francis Countess of Salisbury (age 31) by marriage Baroness Monthermer.
In 1421 Thomas Montagu 1st Count Perche 4th Earl Salisbury (age 32) was restored 4th Earl Salisbury, 3rd Baron Montagu, 6th Baron Montagu, 5th Baron Monthermer although he had been styled Earl since 1409.
On 03 Nov 1428 Thomas Montagu 1st Count Perche 4th Earl Salisbury (age 40) died from wounds received at the Siege of Orléans. His daughter Alice Montagu 5th Countess of Salisbury (age 21) succeeded 5th Countess Salisbury, 4th Baroness Montagu, 7th Baroness Montagu, 6th Baroness Monthermer. Richard Neville Earl Salisbury (age 28) by marriage Earl Salisbury.
Before 09 Dec 1462 Alice Montagu 5th Countess of Salisbury (age 55) died. Her son Richard "Kingmaker" Neville Earl Warwick, 6th Earl Salisbury (age 34) succeeded 6th Earl Salisbury, 5th Baron Montagu, 8th Baron Montagu, 7th Baron Monthermer adding to the earldom of Warwick he had already acquired through his wife some fourteen years previously. The combined earldoms of Warwick and Salisbury made Warwick the second most powerful man in the Kingdom making him Kingmaker.
On 14 May 1790 Stephen Moore 1st Earl Mount Cashell (age 59) died. His son Stephen Moore 2nd Earl Mount Cashell (age 20) succeeded 2nd Earl Mount Cashell. Margaret King Baroness Monthermer (age 17) by marriage Baroness Monthermer.