After Reginald's death in 1322, his daughter Joanna inherited his lands, due to the insanity of her elder brother.
In 1282, Reginald married
Guillemette de Neufchâtel (1260-1317, heiress of the counties of
Montbéliard and Belfort by her great-grandfather Thierry III de Montbéliard 1205-1283), with whom he had a son and four daughters:
Othenin de Montbéliard (Othenin the Mad, d. 1339) – count of Montbéliard under the guardianship of his uncle due to his mental handicap.
Agnès de Montbéliard (d. 1367) – married
Henri de Montfaucon; they received the county of Montbéliard on the death of her elder brother.
Marguerite de Montbéliard – married Guillaume II d'Antigny, lord of the Château de Sainte-Croix (fr).
Alix de Montbéliard, Lady of
Montaigu (Jura), Lons (in part), and
Montfleur – married her cousin Count Jean II of Chalon-Auxerre (d. 1363); their descendants succeeded as Lords of Montaigu (Jura); their son
Jean III was the ancestor of the
Counts of Auxerre and
Counts of Tonnerre.
Sources
(in French)Le Roman d'une Principauté, D. Seigneur. - Éditions : Cêtre (Besançon).
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