General Notes

GEOFFREY, DUKE OF BRITTANY, married Hawise, daughter of Richard I, DUKE OFNORMANDY, and died in 1008, leaving two sons, Alan and Eudon. During their mother's lifetime the two brothers seem to have been joint rulers of Brittany, but on her death, on 21 February 1034, dissensions broke out between them; peace was restored by a settlement under which Eudon received a territory corresponding roughly to the dioceses of Dol, St. Mialo, St. Brieuc and TrÈguier, reduced in the hands of his successors to the two last-named dioceses, while Alan retained the rest of Brittany. After the death of Alan in 1040 Eudon seized the government of Brittany to the exclusion of his nephew Conan, who recovered it in 1057. Eudon died 7 January 1079. He married Orguen, whose parentage is unknown.  [Complete Peerage X:779-81, (transcribed by Dave Utzinger)]

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I will have to research where I picked up that Geoffrey died in Nantes (maybe he was one his way to the Holy Lands or on his way back).  The following information, indicating that Geoffrey died on pilgrimage, came from Curt Hofemann, curt_hofemann@@yahoo.com:

Not sure whether you are saying that Weis & CP give the date & place or just the date & that your source of the place is from elsewhere, but please consider:

... in 1008, Geoffrey of Brittany had likewise set forth on pilgrimage to the Holy Land. [Ref: Wm Conqueror p35]
On Geoffrey's departure in 1008 on the pilgrimage during which he died, his two sons Alan III and Eudo, then of tender age, were left under the tutelage of their Norman mother... [Ref: Wm Conqueror p29]

Prof. Douglas indcates that Geoffrey died either on his way to/from or in the Holy Land.  I am interested to know your source for his place of death.  Thanks.

Other info:
Geoffrey of Rennes, who was subsequently count of Brittany [Ref: Wm Conqueror p29]
Count of Bretagne, Rennes [Ref: Turton]
Duke of Brittany [Ref: CP X:779-81, Weis AR7 39:22]
Duke of Brittany 992-1008 [Ref: Tapsell p203]

Regards,
Curt