Question: Were Uladzimir Harakhavik and Manuel Bryennios of the same nationality?
Sentence (from "Manuel Bryennios"): His only surviving work is the" Harmonika"( Greek: Ἁρμονικά), which is a three- volume codification of Byzantine musical scholarship based on the classical Greek works of Ptolemy, Nicomachus, and the Neopythagorean authors on the numerological theory of music.
Relevant evidence: No