Manuel II Palaeologos on the strife between Bāyezīd I and Ḳāḓị Burhān al-Dīn Aḥmad

The letters of the Byzantine emperor Manuel II Palaeologos, studied and exploited by Byzantinists since they were published for the first time by E. Legrand in 1893, are now available in a new edition by G. Dennis, in which they are translated, accompanied by the appropriate comments and, in most cases, accurately dated. These letters constitute a most valuable contemporary source for the years 1382–1417 because they help to fill one part of the much deplored ‘gap’ in Byzantine historiography. Moreover, they include evidence which sheds light on some details of early Ottoman history, as will appear from the following analysis of Manuel's material dealing with the conflict between the sultan Bāyezīd I and the ruler of Sivas, ḲāḲi Burhān al-Dīn Aḥmad in 1391.