Historical context (brief)
Usman Ghazi was the leader of the Ottoman Turks and the founder of the Ottoman dynasty. At the time of Uthman the Ottoman kingdom was small in size (Beylik) and later it became a huge empire. The empire lasted until the dissolution of the Sultanate in 1922.
On 16 January 1299, Uthman declared the independence of his small kingdom from the Rum Sultanate and assumed the title of Khan of the Kayi tribe. The Ottoman Empire was one of the small Turkish kingdoms that emerged in Anatolia after the breakup of the Seljuks. Among these kingdoms, the Ottomans eventually united Anatolia under Turkish rule.
With the fall of the Byzantine Empire came the rise of the Ottoman Baylich. Origin of the name Uthman: From the earliest times the Ottomans believed that the name of the first Uthman was named after the third Rashidun Caliph Uthman Ibn Affan. But according to some scholars his original name was Turkish which could be Atman or Ataman and later it was changed to Usman. Old Byzantine sources, including George Pekimeres, a contemporary of Uthman, refer to him as Atuman or Atman, while Greek sources refer to him as Uthman.
In an old Arabic formula his name is written by ط instead of ث. Rise of the Empire: According to popular belief, Ertugrul, the father of the first Uthman, brought the Turkish Kayi tribe from Central Asia to Anatolia to protect them from the Mongols. Her mother’s name was Halima Khatun. Uthman Rum Sultan was the first to show allegiance to Kaikobad. The sultan allowed him to establish Beylik in Anatolia and to extend the frontier to the Byzantines in the west. This permission created opportunities as the Byzantine Empire continued to weaken. In the east, on the other hand, the Muslims under the Seljuk Turks were becoming more and more divided due to continuous Mongol aggression and internal strife.
Halaku Khan invaded Baghdad in 1258, the year of Uthman’s birth. In 1251, Ertugrul conquered the Nisian city of Thebesion. It is renamed Sogut, and its temporary capital is Uthman.