Geoffroy de Semur en Brionnais I
- Born: Abt 950, Burgundy, France
- Marriage (1): de Brioude about 960
- Marriage (2): Mathilda (Mahaut) de Chalon, Dame de Donzy
- Died: 1055, Semur, Côte-d'Or, Bourgogne, France aged about 105
FamilySearch ID: 9Z8P-WSC.
Geoffroy married de Brioude, daughter of Viscount Dalmas de Brioude II and Aldiarde, about 960. (de Brioude was born about 935 in Chalon-sur-Saône, Saône-et-Loire, Bourgogne-Franche-Comté, France and died before 962 in Semur-en-Auxios, Côte-d'Or, Bourgogne, France.)
Geoffroy next married Mathilda (Mahaut) de Chalon, Dame de Donzy, daughter of Lambert de Chalon vicomte d'Autun and Adelaide de Vienne. (Mathilda (Mahaut) de Chalon, Dame de Donzy was born in 969 and died in 1019 in Champagne, Dordogne, France.)
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