The book "The Foundations of the Ottoman Empire: The History of the Ottomans to the Death of Bayezid I (1300-1403)" by Herbert Adams Gibbons is an in-depth study of the early years of the development of the Ottoman Empire and the defining figure of the first Sultan of the Ottoman State - Bayezid I. The author examines in detail the history of the Ottomans in the period from 1300 to 1403, revealing the key events, strategies and internal politics of the Osmanli dynasty. Gibbons' book is an important source for understanding the formation and expansion of the Ottoman Empire and Bayezid I's contribution to its history. Carefully researching sources and archival materials, the author gives the reader the opportunity to immerse himself in an important stage of the formation of one of the most influential empires in world history.