Abul Abbas ibn Ahmed al Kosthinahy (1382)
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Taken from: Annali musulmani di Gio. B. Rampoldi. Volume primo [-duodecimo]: 11, Volume 10 Gio. B. Rampoldi.
This personality is the author of a kind of geography on the islands that the Arabs call Raneg, which are in the Ethiopian ocean in front of the beach of the country of the Zengi, called by us Zanguebar, or Costa di Cafreria.
Note: More recent authors having checked the work of this author had to decide
that no such kind of book exists.