(Journal of Academic Inquiries)
Cilt/Volume: 11, Sayı/Issue: 1, Yıl/Year: 2016

The issue of establishment of Ottoman Empire, is a matter that many thinkers came in to different conclusions because of the insufficiency of the sources. Insufficiency of the sources is the reason that the period form Osman
Gazi to Fatih Sultan Mehmet is called disputed years. If he had a Turkish
name with his Muslim name, his relations with other veterans that were active in the West Anatolia and around Sakarya River, Lala Şahin Pasha and his
father Umur Bey are constituting the main striking subjects of this research.
In this study, supported the idea put forward by A. Erzi, intended that the
name of “Toman” in El-Ömerî could be Osman Gazi’s Turkish name rather
than “Ataman” in Western sources and excels the idea of effect the sermon
read on behalf Osman Gazi or his fame may have exceeded Bithynia region. His original name was Turkish, probably Atman or Ataman, and was only later changed to ‘Osmān. The earliest Byzantine sources, including Osman's contemporary George Pachymeres, spell his name as Ατουμάν (Atouman) or Ατμάν (Atman)
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