K. von Fischer: Studien zur italienischen Musik des Trecento und frühen Quattrocento (Berne, 1956), 40–41
G. Cattin: ‘Ricerche sulla musica a S. Giustina di Padova all'inizio del I Quattrocento: il copista Rolando da Casale’, AnnM, vii (1964–77), 17–41
F.A. Gallo: ‘La trattatistica musicale’, Storia della cultura veneta, ii, ed. G. Folena (Vicenza, 1976), 469–76
A. Hallmark: ‘Some Evidence for French Influence in Northern Italy, c.1400’, Studies in the Performance of Late Mediaeval Music, ed. S. Boorman (Cambridge, 1983), 193–225
(fl c1300). French or Spanish theorist. He may have been one of the ‘cantores de Navernia’ mentioned by Admetus de Aureliana. Admetus and Jacobus are known only from citations by Robert de Handlo in his treatise of 1326 (CoussemakerS, i, 397–8, 400–01; ed. P. Lefferts, Lincoln, NE, 1991). Jacobus distinguished three kinds of hocket, each respectively using smaller note values and rests, a typology similar to that of Walter Odington.