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4th century BC Greek orator
Isaeus (Ἰσαῖος Isaios; fl. early 4th century BC) was one of the ten Attic orators according to the Alexandrian canon. He was a student of Isocrates in Athens, and later taught Demosthenes He was a son of Diagoras, and was born at Chalcis in Euboea; some sources say he was born in Athens, probably only because he came there at an early age and spent the greater part of his life there. He was instructed in oratory by Lysias and Isocrates. He was afterwards engaged in writing judicial orations for others, and established a rhetorical school at Athens, in which Demosthenes is said to have been his pupil. The Suda states that Isaeus instructed him free of charge, whereas Plutarch relates that he received 10,000 drachmas; and it is further said that Isaeus composed for Demosthenes the speeches against his guardians, or at least assisted him in the composition. All particulars about his life are unknown, and were so even in the time of Dionysius, since Hermippus, who had written an account of the disciples of Isocrates, did not mention Isaeus at all.

Although his orations were placed fifth in the Alexandrian canon, still we do not hear of any of the grammarians having written commentaries on him, except Didymus of Alexandria. But we still possess the criticism upon Isaeus written by Dionysius of Halicarnassus; and by a comparison of the orations still extant with the opinions of Dionysius, we come to the following conclusion. The oratory of Isaeus resembles in many points that of his teacher, Lysias: the style of both is pure, clear, and concise; but while Lysias is at the same time simple and graceful, Isaeus evidently strives to attain a higher degree of polish and refinement, without, however, in the least injuring the powerful and impressive character of his oratory. The same spirit is visible in the manner in which he handles his subjects, especially in their skillful division, and in the artful manner in which he interweaves his arguments with various parts of the exposition, whereby his orations become like a painting in which light and shade are distributed with a distinct view to produce certain effects. It was mainly owing to this mode of management that he was envied and censured by his contemporaries, as if he had tried to deceive and misguide his hearers. He was one of the first who turned their attention to a scientific cultivation of political oratory; but excellence in this department of the art was not attained until the time of Demosthenes.