The astonishing fact is then clearly demonstrated that Greeks, Venetians, and Genoese made no effort to take advantage of their great opportunity. Nor did they, during the ten years of civil war that followed the death of Bayezid, make any move, in concert or separately, to drive the Osmanlis out of Europe. When it was not yet certain what Timur would do in regard to Asia Minor, or even whether he would invade Europe,[655] the Venetians and Genoese established with Soleiman at Adrianople the same friendly relations that they had been so careful to maintain with his father, and fought each other in the Bosphorus. Pope Boniface was straining every nerve to help Ladislas of Sicily to win the crown of Hungary against Sigismund,[656] who, alone of the princes of Europe, had his hands been free, might have contested the Balkan peninsula with the warring factions of the Osmanlis. The decade of civil war among the sons of Bayezid passed without interference from the outside world, and without a single uprising on the part of the subjugated Balkan Christians. The house of Osman, although divided against itself, did stand. In 1413, Mohammed I, triumphing over his brothers, became sole sovereign of the Osmanlis. The crisis was over, and the career of conquest, interrupted for the moment by Timur, was resumed. Nicopolis had proved that the Osmanlis could hold against Europe what they had won. Angora had proved that they were too firmly rooted in the Balkan peninsula and in north-western Asia Minor, as an indigenous race and as a nation, to be destroyed by the misfortunes of their dynasty. Since the test of possession is ability to hold, in foul weather as well as in fair, who can deny that the Osmanlis under Bayezid had inherited the Byzantine Empire? APPENDIX A TRADITIONAL MISCONCEPTIONS OF THE ORIGIN OF THE OSMANLIS AND THEIR EMPIRE What has been said in this book on the origin of Ottoman power and the foundation of the empire is so different from statements which have found acceptance up to this time, that I am under the obligation to justify my position by a more technical discussion, and by a fuller citation of authorities, than has been given in Chapter I. I shall deal with these misconceptions singly. 1. THAT OSMAN WAS A PRINCE OF ILLUSTRIOUS BIRTH.