The County of Auxerre is a former state of current central France, with capital in Auxerre. History The first count attested by the sources is one Ermenaud, a companion of Charlemagne who reigned around 770. In 859 Charles the Bald handed over the county to his cousin Conrad II of Burgundy. When he revolted, the county was assigned to Robert the Strong. After the latter's death, Hugh the Abbot was count, but named a viscount in his lieu; later Auxerre was absorbed in Richard of Burgundy's dominion. Count John IV sold it to the King of France in 1370. After the Treaty of Arras (1435) between Charles VII of France and Philip III of Burgundy, it returned once again to the latter. In 1477, with the annexion of Burgundy, it became definitively part of France. See also Nevers Duchy of Burgundy List of counts Peonius, under Chlothar I Ermenaud I of Auxerre, ca. 758 Ermenaud II of Auxerre ca. 800 Ermenaud III of Auxerre, ca. 840 Jouvert of Auxerre, ca. 853 Conrad I of Auxerre, duke of Transjuran Burgundy, 859–864 Robert the Strong, 864–866 following his marriage with Conrad's widow Adelaide of Tours Conrad II of Auxerre, son of Conrad and Adelaide, 853–876 Hugh the Abbot, younger brother of Conrad II, 876–886 Richard the Justiciar, 886–921, married Conrad II's daughter Adelaide Rudolph of France (also Raoul or Ralph), 921-923 until his election as King of France Hugh the Black, 923-952 Gilbert of Chalon, 952-956 Otto of Paris, 956-965 Otto-Henry 965–1002 Landerich of Monceau, 1002-1028 Renauld, son of Landerich, 1028–1040 Robert I, Duke of Burgundy, briefly in 1040 William I, Count of Nevers, son of Renauld, 1040–1083 Renauld II of Nevers (son) 1083–1089 (count of Auxerre and Nevers) William II, Count of Nevers (son) 1097–1148 (count of Auxerre, Tonnerre and Nevers) William III, Count of Nevers (son) 1148–1161 (count of Auxerre, Tonnerre and Nevers) William IV, Count of Nevers (son) 1161–1168 (count of Auxerre, Tonnerre and Nevers) Guy I of Nevers (brother) 1168–1175 (count of Tonnerre, Auxerre and Nevers) William V, Count of Nevers (son) 1175–1181 (count of Auxerre, Tonnerre and Nevers) Agnes I of Nevers (sister) 1181–1192 Peter II of Courtenay 1184–1218 (married to Agnes) Mahault I of Coutenay (daughter) 1218–1257 Hervé of Donzy 1218–1222 (married to Mahault) Agnes II of Donzy (daughter) 1218–1225 (deceased before her mother) Guy II of Châtillon, count of Saint Pol 1223–1225 (married to Agnes