Freedman of M. Aemilius Avianius, managing his patron's estate at Sicyon (Achaea) as procurator in his patron's absence. He had personally assisted Cicero in difficult times with exceptional loyalty. Cicero recommends him to Servius Sulpicius in Fam. 13.21. His cognomen Hammonius (from the Egyptian god Ammon) indicates likely eastern Mediterranean origin.