Nonnus (Ancient Greek: Νόννος, Nónnos) was legendary 4th- or 5th-century[n 1] Christian saint, said to have been an Egyptian monk who became a bishop in Syria and was responsible for the conversion of St Pelagia the harlot during one of the Synods of Antioch.

[9] After being pursued by the devil for a few days, she donated the property from her former employment to the church and lived with the deaconess Romana before departing for Jerusalem to disguise herself as a male hermit under the name Pelagius.

Chrysostom's c. 390 sermon also mentions an anonymous (but apparently famous) actress and prostitute "from a wicked city in Phoenice" (possibly Heliopolis) who seduced "the empress's brother" but converted "in our own day".

[20] In his account, attempts were made to lure her back to her former life by the Roman prefect and some of his soldiers,[2] a role played by Satan in the hagiography.

[3] The mention of a meeting of the Syrian bishops is unhelpful for dating, as more than thirty Synods of Antioch were conducted in late antiquity.