Marcus was the son of Quintus Flaccus and Sulpicia of Rome. The date and place of his birth have not been found.
His wife is not known. They were married, but the date and place have not been found. Their only known child was Marcus II Flaccus (?-0121BC).
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|---|
| Nobility Title | 0180 B.C. | trib. mil. of Rome |