There was a close association with the Duchy of Brittany from the inception of the honours and titles associated with Richmond until the reign of John V.
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It appears to have been in existence in England from 1071 shortly after the Harrying of the North, a military campaign shortly after the date of the Battle of Hastings (1066).
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After John V, the English crown ceased to recognize the Breton rulers as Earls of Richmond and the crown frequently assigned the Honour of Richmond to English nobles.
Alan Rufus (alternatively Alain Le Roux, or Alan Ar Rouz in Breton, called Count Alan in the Domesday Book, his name means "Red Deer") (d. between 1093 and 1098) - effectively the first Earl of Richmond, though the majority of his manors were in East Anglia.
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Stephen, Count of Tréguier married Havise of Guingamp - succeeded Alan Rufus and Alan the Black as de facto Earl of Richmond.
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During the Anarchy, Alan the Black II claimed Cornwall on the basis of his uncle Brian having held it; a claim that was accepted by King Stephen.
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Francis I (in Breton Fransez I, in French François I) (Vannes/Gwened, 14 May 1414 – 18 July 1450, Château de l'Hermine/Kastell an Erminig), was Duke of Brittany, Count of Montfort and titular Earl of Richmond, from 1442 to his death.
Like the first lords of Richmond, Peter II of Savoy and Ralph de Neville, 1st Earl of Westmorland, before him, Clarence was endowed with the Honour of Richmond, a lifetime grant, but without the peerage title of Earl of Richmond.
Peter II (in Breton Pêr II, in French Pierre II) (1418–1457, Nantes/ Naoned), was Duke of Brittany, Count of Montfort and titular earl of Richmond, from 1450 to his death.