Blanca de Castilla was a Spanish princess who became the most powerful human being in France as Regent and Queen, from 1226 to 1252. From Elie Berger's, Histoire de Blanche de Castille, Reine de France (Paris, 1895), there can be no question that Blanche ruled France during a critical period of Capetian expansion, even imperialism. Berger's biography remains the best scholarly treatment of the manuscript sources, which include the Tresor des Chartes...
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History