Ertoghrul and his horsemen were a welcome support to Alaeddin’s waning fortunes. In a later encounter with a small Byzantine force they came off victorious, and Alaeddin made a further addition to their territory on the borders of his own, over which he had a very nominal sovereignty. Thenceforth Ertoghrul lived an uneventful pastoral life as the head of his clan or tribe of Turks in the ceded territory, till his death in 1288, nearly fifty years from the date of his leaving Khorassan. His son, Othman, who was born at Sugut in 1258, was chosen by the clan to succeed him, and soon commenced a much more ambitious career than that of his father. When of the age of only sixteen he had fallen in love with the beautiful daughter of Sheik Idebali, a holy man of great repute in Karamania. It is evidence of the small account then held of Ertoghrul and his son that the Sheik did not think the marriage good enough for his daughter. It was only after a long and patient wooing by Othman, and as the result of a dream, which foretold a great future of empire for his progeny, that Idebali gave consent to the marriage. There were no contemporary Turkish histories of the early Ottoman Sultans. It was not till many years after the capture of Constantinople in 1453 that Turkish historians wrote about the birth of their State. They had to rely upon traditions, which must be accepted with much reserve. This, however, is certain, that Othman, in his thirty-eight years of leadership, increased his dominion from its very narrow limits at Sugut and Eski-Sheir to a territory extending thence northward to the Bosphorus and Black Sea, a distance of about a hundred and twenty miles by an average breadth of sixty miles, an area of about seven thousand square miles. There are no means of estimating its population. It was probably sparse, except on the coast of the Marmora and Black Sea. It included only one important city, Brusa, which was surrendered by its garrison and citizens shortly before the death of Othman in 1326, after being hemmed in and cut off from communication with Constantinople for many years. Considerable as these additions were, the nascent State could not even yet be considered as important in size. It was exceeded by several of the larger Turkish Emirates in Asia Minor, such as Karamania, Sarukhan, and others.