Osman's Dream: The Story of the Ottoman Empire 1300-1923 - Caroline Finkel - Google Books

https://books.google.de/books?id=hslOx5bvOzkC&pg=PT98&dq=Ishak+Bey+Kralo%C4%9Flu&hl=de&sa=X&ved=0ahUKEwjlnrqczZDWAhWDXhQKHRLaA-Y

The Ottoman chronicles recount that the first sultan, Osman, dreamt of the dynasty he would found - a tree, fully-formed, emerged from his navel, symbolising the vigour of his successors and the extent of their domains.This is the first book to tell the…