Analysis of information sources in references of the Wikipedia article "Osman I" in Galician language version.
Reliable information regarding Osman is scarce. His birth date is unknown and his symbolic significance as the father of the dynasty has encouraged the development of mythic tales regarding the ruler’s life and origins, however, historians agree that before 1300, Osman was simply one among a number of Turkoman tribal leaders operating in the Sakarya region.
By the time of Osman's death (1323 or 1324)...
There is still not one authentic written document known from the time of ʿOsmān, and there are not many from the fourteenth century altogether.