No biographical information exists for an author named Antigonus who wrote rhetorical letters. The name was common in the Hellenistic period, most notably borne by Macedonian kings and generals like Antigonus I Monophthalmus, but these figures are not known as literary epistolographers.

The sole attributed work is the Letters. No details regarding their content, recipients, or manuscript tradition are attested in standard literary histories or fragment collections.

The significance of the Letters attributed to Antigonus cannot be established, as neither the work nor its author is substantiated in the scholarly record. If genuine, such a collection would be valuable for studying Hellenistic prose and epistolary rhetoric, but its absence suggests a misattribution, a lost work, or a conflation with a historical figure.