Sgr. de Purrières, Seigneur de Cuers.
[C-D, IX, 331] [17] has this Isnard (clearly the same one, with the same date of death, and the same nickname, Le Grand), and he mentions three wives. [RW] [34] quotes [ART, I, 493] [57], and [ES, XIV, 38] [44] for the Anduze wife.

[C-D, IX, 331] [17]: He was made Lieutenant-General in Provence. Marie de Blois gave him command of the lieux de la Montagne [?], against the rebel Turenne (Beaufort Rosières), by letters dated 6 July 1391. He gave great service to the Counts of Provence, to whom he paid homage for his lands in 1399, and died in 1409, being enterred in l’Eglise des Frères-Précheurs d’Aix, with a great magnificence. The Bishop of Grasse performed the office. His wives were Alix de la Voulte, Isoarde de Roquefeuil, and Béatrix des Balbs. Alix de la Voulte is almost certainly the same as Audis d’Anduze, as the father of Audis was Seigneur de la Voulte.

[C-D, I, 496] [17] has nothing on Anduze at this early date, only entries from 1539 on, and not many of them.
[ES, XIV, 38] [44] has the details.