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In a recent article Professor CI. Cahen pointed out various problems resulting from the history of the region of Kastamonu, which on account of its remoteness from the political centres attracted little attention from the chroniclers. One of the problems is the incompatibility of the narratives of the oriental sources and the writings of the Byzantine historian George Pachymeres with respect to some events of the reign of the Seljuk Sultan Masud II: Pachymeres while referring to the history of Kastamonu produces a certain Ali Amourios, his brother Nasir ed-din — a person of lesser importance—and their father, whom he also names Amourios. The same Amourios and his sons are also mentioned by Nikephoros Gregoras, who, however, passes over in silence the sons’ names.
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Elizabeth Zachariadou (1977) studied this question.
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