Shota
Παλαιό Μέλος
I attach the paper "Echos und Makam. nach der Handschrift Leningrad, Öffentliche Bibliothek, gr. 127" by Heinrich Husmann (Archiv für Musikwissenschaft 36. Jahrg., H. 4. (1979), pp. 237-253), which deals with one Greek ms of the 18th c. preserved in St. Petersburg that contains a theoretical treatise on makams as well as a large number of secular songs in makam style. My guess is that the corresponding treatise is that by Kyrillos Marmarinos or possibly its some predecessor.