GEOFFROY de Bretagne, son of CONAN I "le Tort" Duke of Brittany & his wife Ermengarde d'Anjou ([980]-20 Nov 1008). His parentage is confirmed by the Chronico Sancti Michaelis which records that "Gaufridus Dux Britanniæ filius Conani filii Juhelli Berengarii" died in 1008 "dum pergeret Romam causa orationis"[137]. He succeeded his father 992 as GEOFFROY I Duke of Brittany. A charter dated 1026 recalls that "Gaufridus, Conani Curvi filius" was killed "apud Concuruz prelium"[138]. The Chronicon Kemperlegiense records the death "dum pergeret Romam" in 1008 of "Gauffridus Dux Britanniæ filius Conani filii Iuhaëlis Berengarii"[139].
m (996) HAVISE de Normandie, daughter of RICHARD I "Sans-Peur" Comte [de Normandie] & his second wife Gunnora --- (-21 Feb 1034). Guillaume of Jumièges names “Emma...secunda Hadvis...tertia Mathildis” as the three daughters of Richard and his wife “Gunnor ex nobilissima Danorum prosapia ortam”, adding that Havise married “Goiffredo Britannorum comiti” by whom she had “Alanum et Eudonem duces”[140]. A charter dated 1008 records that, after the death of "Gaufrido comite Britanniæ", "filii eius Alanus et Eudo cum matre eorum Hadeguisia" restored the abbey of Saint-Méen[141]. "…Aduise matre eorum comitum…" signed the charter dated to [1013/22] under which "Alanus et Egio Britannorum monarchi" founded the priory of Livré "in pago Redonensi"[142]. The Chronico Kemperlegiensi records the death "1034 IX Kal Mar" of "Haduisa comitissa Britanniæ, vidua Gauffridi"[143].
Duke Geoffroy I & his wife had three children