The County of Blois was originally centred on Blois, south of Paris, France.
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Charles de Blois, son of Guy I, Count of Blois, married Joan of Penthievre, the heiress of John III, Duke of Brittany; together, they became principal protagonists in the War of the Breton Succession.
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Upon the death of his only son, Guy II, Count of Blois sold the county to Louis I, Duke of Orléans and the county passed to the French royal family.
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Bertha of Blois, the daughter of Odo II of Blois, became Duchess Consort of Brittany through her marriage to Alan II, Duke of Brittany.
Blois | Counts of Celje | count of Blois | Henry of Blois | Odo II, Count of Blois | Stephen, Count of Blois | Peter of Blois | Odo I, Count of Blois | Counts of Ortenburg | Counts of Eu | Cabinet of Three Counts | Treaty of Blois (1509) | Counts of Vianden | Counts of Schauenburg and Holstein | counts of Celje | Counts of Andechs | Counts and Dukes of Rethel | Counts and dukes of Rethel | Counts and Dukes of Nevers | Counts and Dukes of Guelders | Counts and Dukes of Alençon | Blois baronets |