EUSTATHIUS, archbishop of Thessalonica, was a native of Constantinople, and flourished during the latter half of the twelfth century. Such of his works as have descended to our times display a comprehensiveness and variety of erudition that fairly entitle him to the praise of being the most learned man of his day. The most important of these is his Commentary on the Iliad and Odyssey of Homer, a work valuable as comprising large extracts from the scholice of other critics whose works have now perished, such as Apion, Heliodorus, Aristarchus, Aristophanes of Byzantium, &c. This commentary was first published at Rome, 1542-50, in 4 vols., and was reprinted at Leipzig in 1825-29, under the editorial care of G. Stalbaum. Eustathius also wrote a Commentary on Dionysius the Geographer, first printed by Robert Stephens in 1547, and frequently reprinted since. A Commentary on Pindar, which he is known to have written, has been lost. Eustathius died in 1198. The funeral orations pronounced in his honour by Euthynius and Michael Choniates are still in MS. in the Bodleian Library.