For the period after 1389, and in particular for the years of Ottoman strife which followed the battle near Ankara in 1402, the sources for Turkish history are comparatively scarce. It seems useful, therefore, to publish documents in the Hospitallers'Rhodian archives which are now in the National Library of Malta. The introductory sections are intended to present the texts within a comprehensible context rather than to rewrite in detail the general history of the period.