Note 9 — Chapter II · REBELLION AND EXILE
Reading edition
The date at which the quarrel began is uncertain. It must have been after 13 September 1077, when Robert was present with his parents and William Rufus at the dedication of Saint-Étienne at Caen. Supra, p. 16. The siege of Gerberoy, which marks its termination, took place in December and January 1078-79. Infra, n. 38.