(Manuel), a Greek writer on music, is supposed to have flourished under the elder Paleologus, viz. about the year of Christ 1120. He wrote three books on Harmonics; the first whereof is a kind of commentary on Euclid, as the second and third are on Ptolemy. He professed to have studied perspicuity for the sake of young men. Meibomius had given the public expectations of a translation of this work; but not living to complete it, Dr Wallis undertook it; and it now makes a part of the third volume of his works, published at Oxford in three volumes folio, 1609.

Bryennius (Nicephorus), a prince distinguished by his courage, probity, and learning, was born at Oreftia in Macedonia; where his father by rebellion provoked the emperor to send his general Alexis Comnenus against him, who ordered his eyes to be pulled out; but being charmed with his son Bryennius, he married him to Anne Comnenus his daughter, so famous by her writings. When Alexis came to the throne, he gave Bryennius the title of Caesar; but would not declare him his successor, though solicited to it by the empress Irene; and was therefore succeeded by his son John Comnenus, to whom Bryennius behaved with the utmost fidelity. Being sent, about the year 1137, to besiege Antioch, he fell sick; and, returning, died at Constantinople. This prince wrote the History of Alexis Comnenus, which he composed at the request of his mother-in-law the empress Irene.