Hesychius' explanations of many epithets and phrases also reveal many important facts about the religion and social life of the ancients.
In a prefatory letter Hesychius mentions that his lexicon is based on that of Diogenianus (itself extracted from an earlier work by Pamphilus), but that he has also used similar works by Aristarchus, Apion, Heliodorus and others.
Hesychius was probably a pagan. Explanations of words from Gregory Nazianzus and other Christian writers (glossae sacrae) are later interpolations.
The lexicon survives in one deeply corrupt 15th century manuscript, which is preserved in the library of San Marco at Venice, (Marc. Gr. 622, 15th century). The best edition is by M. Schmidt (1858-1868), but no complete comparative edition of the ms has been published since it was first printed by Marcus Musurus at the press of Aldus Manutius) in Venice, 1514 (reprinted in 1520 and 1521 with modest revisions).
Under the auspices of the Danish Academy in Copenhagen a modern edition has been in intermittent publication since 1953: alpha to omicron have been published.