The castle was founded in the 10th century by Odo I, Count of Blois.
Count | Blois | Count Basie | count | Count Dracula | The Count of Monte Cristo | Imperial Count | Count of Flanders | Count of Barcelona | Count Basie Orchestra | Gaspar de Guzmán, Count-Duke of Olivares | Count of Soissons | You Can Count on Me | Jean-Frédéric Phélypeaux, Count of Maurepas | Count Palatine | Count palatine | Count of Paris | John II, Count of Rietberg | Count of Nevers | count of Blois | William I, Count of Nassau-Dillenburg | Simon VI, Count of Lippe | Ramon Berenguer II, Count of Barcelona | Ramon Berenguer I, Count of Barcelona | Prince Gaston, Count of Eu | Peter II, Count of Savoy | Odo the Great | Juan Vicente de Güemes, 2nd Count of Revillagigedo | Henry of Blois | Gustav Horn, Count of Pori |
When the House of Bar, which ruled in Upper Lorraine, became extinct in 1033, with the death of his cousin Frederick III, Conrad made him duke of both duchies, so that he could assist in the defence of the territory against Odo II, count of Blois, Meaux, Chartres, and Troyes (the later Champagne).
Guy II of Blois-Châtillon (died December 22, 1397), the youngest son of Louis I of Châtillon and Joan of Avesnes, was count of Blois and lord of Avesnes, Schoonhoven, and Gouda 1381–1397, and lord of Beaumont and Chimay.
Mieszko I, after winning the 972 Battle of Cedynia against the Saxon margrave Odo I, had annexed to the early Polish state the territory on which later the town was founded.
The West Slavic Polans had established a state east of the Saxon marches and, aiming to advance into the Pomeranian lands north of the Warta river, had reached an agreement with late Margrave Gero and Emperor Otto I: Mieszko's ducal title was confirmed and the Polans paid a recurring tribute to the emperor, which was collected by Margrave Odo.
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The margrave, intending to compel Mieszko to pay tribute for the Pomeranian territory between the Oder and Warta rivers, invaded that region.
Theobald VI of Blois (French: Thibaut) (died 1218) was count of Blois and Clermont-en-Beauvaisis from 1205 to 1218.