George Choiroboskos (Greek: Γεώργιος Χοιροβοσκός), Latinized as Georgius Choeroboscus, was an early 9th-century Byzantine grammarian and deacon.
His reputation was certainly blackened, so that the 12th-century bishop and scholar Eustathius of Thessalonica, who quotes frequently from his works, fulminates against those who gave the "wise teacher" this nickname out of envy, and thereby condemned him to oblivion.
[2] George Choiroboskos wrote a number of works on grammar, which have often survived only in fragments, as well as in the notes of his pupils.
[2][3] He wrote a commentary on the canons of Theodosius of Alexandria on declension and conjugation, which survives complete; commentaries on the works of Apollonius Dyscolus, Herodian, Hephaestion of Alexandria and Dionysius Thrax, which survive in fragments; a treatise on orthography, also fragmentary; a set of epimerisms, grammatical analyses of the Psalms, which were used in Byzantine schools; and a treatise on poetry, later translated into Old Slavonic and included in Sviatoslav II's Izbornik.
[1][3] According to Robert Browning in the Oxford Dictionary of Byzantium, "the dry and detailed treatises of Choiroboskos played a major part in transmitting ancient grammatical doctrine to the Byzantine world",[1] and were later mined by Renaissance scholars like Constantine Lascaris and Urban of Belluno for information on literary Greek.