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Guy de Brienne, Count of Bar-sur-Seine, was born 1105 to Milon II de Brienne (1075-1126) and Mathilde de Noyers and died 1156 of unspecified causes. He married Isabelle de Villemaur (1104-) 1126 JL . He married Petronille-Elisabeth de Chacenay (1120-c1163) .
Children
| Name | Birth | Death | Joined with |
| Milon de Brienne | |||
| Name | Birth | Death | Joined with |
| Guillaume de Brienne | |||
| Guy de Brienne | |||
| Manasses de Brienne | |||
| Thibaut de Brienne (1145-1204) | 1145 | 1204 | Marguerite de Salmaise |
| Ermesinde de Brienne (1155-1212) | 1155 | 1212 | Anseau de Trainel Thiébaut I de Bar (1158-1214) |
Footnotes (including sources)
| ‡ General |