Letter 209 was sent by Augustine to Pope Celestine I to explain the case of Bishop Antoninus of Fussala (see [399]). Augustine presented the background of the case: Fussala (in the diocese of Hippo, but distant from it) was an entirely Donatist place, and the first missionary efforts of the Catholics (presumably after the Edict of Union in 405) were unsuccessful. It is interesting to see that the presbyters are specifically mentioned as carrying out such missionary activity. We cannot be sure about the real extent of the price that the presbyters paid; Augustine had talked in detail about mistreatment of the Catholic clerics by Donatists before ([463], [464], [550], [565], [715]), but he never mentioned Fussala as the place of such situations.