Agrestius Chromatius was vicar to the city prefect in Rome under Diocletian.
According to a legend of Saint Sebastian, Chromatius was later converted to Christianity by Tranquillinus and baptized by Polycarp.
Chromatius lived quietly on his country estate for many years, welcoming other Christians into his home to protect them from persecution.
[3] Chromatius had a son, Tiburtius, who was baptized through the persuasion of Sebastian, who served as his godfather.
[6] According to Alban Butler, Chromatius was mentioned in several ancient martyrologies along with his son Tiburtius; they are commemorated on August 11.