Hardly were his tribesmen settled, however, among the Bithynians and Greeks of Yenishehr, before the Seljuk collapse became a fact. The Tartar storm, ridden by Jenghis Khan, which had overwhelmed Central Asia, spent its last force on the kingdom of Konia, and, withdrawing, left the Seljuks bankrupt of force and prestige and Anatolia without an overlord. The feudatories were free everywhere to make or mar themselves, and they spent the last half of the thirteenth century in fighting for whatever might be saved from the Seljuk wreck before it foundered for ever about 1300 A.D. In the south, the centre, and the east of the peninsula, where Islam had long rooted itself as the popular social system, various Turki emirates established themselves on a purely Moslem basis—certain of these, like the Danishmand emirate of Cappadocia, being restorations of tribal jurisdictions which had existed before the imposition of Seljuk overlordship. In the extreme north-west, however, where the mass of society was still Christian and held itself Greek, no Turkish, potentate could either revive a pre-Seljukian status or simply carry on a Seljukian system in miniature. If he was to preserve independence at all, he must rely on a society which was not yet Moslem and form a coalition with the ‘Greeks’, into whom the recent recovery of Constantinople from the Latins had put fresh heart. Osman, who had succeeded Ertogrul in 1288, recognized where his only possible chance of continued dominion and future aggrandizement lay. He turned to the Greeks, as an element of vitality and numerical strength to be absorbed into his nascent state, and applied himself unremittingly to winning over and identifying with himself the Greek feudal seigneurs in his territory or about its frontiers. Some of these, like Michael, lord of Harmankaya, readily enough stood in with the vigorous Turk and became Moslems. Others, as the new state gained momentum, found themselves obliged to accept it or be crushed. There are to this day Greek communities in the Brusa district jealously guarding privileges which date from compacts made with their seigneurs by Osman and his son Orkhan.