Research Notes:

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”. 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. "Alanus et Egio Britannorum monarchi" founded the priory of Livré "in pago Redonensi" by charter dated to [1013/22], signed by "…Aduise matre eorum comitum, Rivalloni vicarii, Triscanni…". A charter dated 1026 recalls that "Gaufridus, Conani Curvi filius" was killed "apud Concuruz prelium", recalling that "quo defuncto, Alanus filius eius…renum patris suscipiens", witnessed by "Alanus comes…Heudo frater eius".

He appears to have ruled Brittany jointly with his brother until the death of their mother in 1034. Following disputes with his brother, a division of territories was agreed, Eudes taking the dioceses of Dol, Saint Malo, Saint Brieuc and Tréguier, at which time he can be said to have become Comte de Penthièvre. "Manigenius…miles" founded the priory of Saint-Cyr-lès-Rennes and donated it to Tours Saint-Julien by charter dated 23 May 1037, subscribed by "Alanus dux…Eudonis fratris Alani ducis Britannorum, Gotzelini vicecomitis, Rualentis domini Doli…". After the death of his brother in 1040, Eudes seized Brittany and excluded his nephew, succeeding as EUDES I Duke of Brittany. According to Orderic Vitalis, Eudes ruled the country "freely without acknowledging any lord for 15 years". However, his nephew retaliated, captured Eudes and imprisoned him in chains. "Comes Eudo et nepos eius Gaufridus, Robertus vicecomes et frater eius Eudo…Guichomarus filius Alani vicecomitis…" witnessed a charter dated to 1050 relating to the abbey of Saint-Georges de Rennes. "Comes Eudo, uxor eius Orguen et filii eorum Gausfridus, Alanus, Willelmus, Rotbertus, Ricardus…" witnessed the charter dated to [1056/60] records the history of the acquisition by Angers Saint-Aubin of property "in pago Belvacensi", finally donated by "comiti Britannie Eudoni".

The Chronicon Britannico records the death in 1079 of "Eudo Dux Britanniæ". ¹