Manuel, a Greek writer on music, who is supposed to have flourished under the emperor Andronicus I., who reigned from 1282 till 1328. He wrote three books of harmonics, the first of which is a kind of commentary on Euclid, while the second and third are illustrative of the theory of Ptolemy. Meliboeus had given the public expectations of a translation of this work, but not living to complete his task, Dr Wallis published it in 1680; and it now forms part of the third volume of his works, published at Oxford in 3 vols. fol., 1699. In the Royal Library at Paris there are several fine MSS. of Bryennius's work; which, however, throws no light on the mysterious subject of the structure of ancient Greek melody.