Biography of Bertrand Geusclin 1320-1380
Around 1320 Bertrand Geusclin was born at Motte Broons.
On 29 Sep 1364 Battle of Auray decided the Breton Succession in favour of John Montfort V Duke Brittany (age 25). The Breton and English army was commanded by John Chandos (age 44) and included William Latimer 4th Baron Latimer of Corby (age 34), Miles Stapleton (age 44) and Hugh Calverley (age 40). Charles "Saint" Chatillon Duke Brittany (age 45) was killed. Bertrand Geusclin (age 44) surrendered. 
On 03 Apr 1367 the forces of Peter "Cruel" I King Castile (age 32) commanded by Edward "Black Prince" (age 36) defeated the army of Henry "Fratricide" II King Castile (age 33) at the Battle of Nájera at Nájera. The English forces included John of Gaunt 1st Duke Lancaster (age 27), William Scrope, Peter Courtenay (age 21), John Devereux 1st Baron Devereux (age 30), John Savile of Shelley and Golcar (age 42), Bernard Brocas (age 37) and Thomas Banastre (age 33).
The forces of Henry "Fratricide" II King Castile (age 33) included Bertrand Geusclin (age 47). The battle achieved little since Bertrand Geusclin (age 47) escaped.
John Ferrers 4th Baron Ferrers of Chartley (age 36) was killed. His son Robert Ferrers 5th Baron Ferrers of Chartley (age 9) succeeded 5th Baron Ferrers of Chartley. Margaret Despencer Baroness Ferrers of Chartley by marriage Baroness Ferrers of Chartley.
Edward "Black Prince" (age 36) thereafter returned home, taking Peter's daughters Constance (age 13) and Isabella (age 12) as hostages to ensure Peter would pay the money owed to Edward. Constance (age 13) married John of Gaunt 1st Duke Lancaster (age 27), Isabella (age 12) married Edmund of Langley 1st Duke York (age 25).
On 14 Mar 1369 the army of Henry "Fratricide" II King Castile (age 35) defeated that of his half-brother Peter "Cruel" I King Castile (age 34) at the Battle of Montiel. Henry "Fratricide" II King Castile 1334-1379's army was commanded by Bertrand Geusclin (age 49). Peter "Cruel" I King Castile (age 34) escaped to the castle of Montiel, La Mancha.
On 21 Mar 1373 John Devereux 1st Baron Devereux (age 36) was captured during the Battle of Chiset at Chizé at which the English were defeated by the French forces commanded by Bertrand Geusclin (age 53). The battle brought an end to English control in Poitou.
In 1380 Bertrand Geusclin (age 60) died at Châteauneuf de Randon.