Agnes I (1170 – in 1192 or 1193 in Mailly), Countess of Nevers, Auxerre and Tonnerre (1185-1192), daughter of Guy, Count of Nevers, Auxerre and Tonnerre, and Mathilde de Burgundy, dame of Montpensier. [1]
Heiress of the counties of Nevers, Auxerre and Tonnerre at the death of her brother William V in 1181, [2] she was initially married to Olivier "Albus," lord of Grignon († 1181/84). [2] When Olivier died, King Philip Augustus arranged her marriage in 1184 - she was 14 - with Peter II of Courtenay. [2]
In 1185, she and her husband Peter confirmed by charter the privileges of the church of Saint-Étienne, and on 10 June 1190 they renounced by charter their hereditary rights in favor of Saint-Cyr. In 1191 they bought Tonnerre of Agnes's mother, Mathilde of Burgundy. [2]
She died in 1192 or 1193, while her husband fought in the Holy Land with the Third Crusade, leaving a daughter, Matilda (1188 † 1257), [2] Countess of Nevers, Auxerre and Tonnerre, who married with Hervé IV of Donzy († 1222) in 1199, [3] and in 1226 with Guigues IV of Forez († 1241). [3]