See Cantacuzene (l. ii. c. 39, 40, l. iv. c. 3, 23, 24, 25) and Nic. Gregoras (l. xi. c. 10, l. xv. 3, 7, etc.), whose last books, from the xixth to xxivth, are almost confined to a subject so interesting to the authors. Boivin (in Vit. Nic. Gregorae), from the unpublished books, and Fabricius (Bibliot. Graec. tom. x. p. 462 - 473), or rather Montfaucon, from the Mss. of the Coislin library, have added some facts and documents.