Hugh de Joinville
Hugh de Joinville (died 1347), lord of Gex, was son of William de Joinville and Joan of Savoy-Vaud, daughter of Baron Louis I of Vaud. In 1334 he and the abbot of Saint-Claude settled their Mijoux valley dispute, declaring it common land and founding a pilgrim hospice.
He married Joan of Montbéliard but left no children. At his death Gex passed to his sister Eleanor, then by her second marriage to the Genevan lords, until Amadeus VI of Savoy conquered it in 1353–1355.