[1] His brothers were Jean, a knight and maître de l'hôtel to the French kings John II and Charles V; Michel, an archdeacon of Ostrevent in the diocese of Arras, who with Gérard co-founded the Collège de Dainville of the University of Paris; and Nicolas, a canon at Paris, Arras and Avranches, and a penitentiary (1362–67).
[1] Acting on behalf of the Emperor Charles IV, Gérard invested Duke Albert I of Bavaria-Straubing with the County of Hainaut.
In 1375, Gérard imposed a new tax (maltôte) without the consent of the chapter, engendering a dispute with the magistrate.
[2] In 1378, Gérard promised to submit to the Archbishop of Reims, but died on 18 June before he could make good.
He was buried in the cathedral of Cambrai under an epitaph that reads, "Hear lies the reverend father of good memory, Gérard de Dainville, one bishop of Arras, then Thérouanne and afterwards Cambrai, who died on 18 June 1378" (Hic jacet Reverendus Pater bonae memoriae G. de Dainvilla, quondam Atrebat., Morin., et postea Camer.