"In the preserved literature we encounter traces of several other books concerned with Antioch or Syria. One of the early works is the ιστορικα υρομνηματα of Euphorion of Chalcis (born ca. 275 B.c.), who was a librarian of the royal library at Antioch under Antiochus the Great (224-187 B.C.); this apparently dealt with the history of Antioch and the Seleucid kings. Euphorion's work seems to have been a forerunner of the great history of Posidonius of Apamea, in fifty-two books (now lost), which was a source of material (including information about Antioch) for the geographer Strabo. Another great historical work in which Antioch played a part was the compilation of Nicolaus of Damascus. In the time of Antiochus IV (176-146 B.c.) Protagorides of Cyzicus wrote a treatise "On the Festivals in Daphne" The work of Athenaeus of Naucratis "On the Kings of Syria" doubtless contained material on Antioch."
The Greek title of Protagorides' work is Περὶ Δαφνικω̂ν ἀγώνων. He appears to be known only because of Athenaeus of Naucratis's mentions of him. In fact he says: "But Protagorides of Cyzicus, in the second book of his treatise on the Assemblies in Honour of Daphne, says, "He touched every kind of instrument, one after another, castanets, the weak-sounding pandurus, but he drew the sweetest harmony from the sweet monaulos". This implies that Protagorides wrote more than one volume on the subject of Daphne.
I have discussed Euphorion previously here.
An academic paper on the note "On the Kings of Syria" by Paola Ceccarelli can be found here.