The latter part of the fourteenth century must, therefore, be regarded as a period of depression in European civilization, of retrograde movement during which the wheels of progress had turned back. It even seemed as though Asia would once more and perhaps with final success reassert her dominion over helpless Europe. The Seljuk Turks who, in 1291, had conquered Acre, the last European stronghold in the Holy Land, had lost their power; but a new family of the Turkish race, the one that dwells in Europe to-day, the Osmanlis, had built up an empire by conquest over their fellows, and had begun to wrest province after province from the feeble Empire of the East. In 1354 their advance brought them across the Bosporus and they seized their first European territory.[23] Soon they had spread over most of modern Turkey. Only the strong-walled Constantinople held out, while its people cried frantically to the West for help. The invaders ravaged Hungary. A crusade was preached against them; but in 1396 the entire crusading army, united with all the forces of Hungary, was overthrown, almost exterminated in the battle of Nicopolis. Perhaps it was only a direct providence that saved Europe. Another Tartar conqueror, Timur the Lame, or Tamburlaine, had risen in the Far East.[24] Like Attila and Genghis Khan he swept westward asserting sovereignty. The Sultan of the Turks recalled all his armies from Europe to meet this mightier and more insistent foe. A gigantic battle, which vague rumor has measured in quite unthinkable numbers of combatants and slain, was fought at Angora in 1402. The Turks were defeated and subjugated by the Tartars. Timur's empire, being founded on no real unity, dissolved with his death, and the various subject nations reasserted their independence. Yet Europe was granted a considerable breathing space before the Turks once more felt able to push their aggressions westward. THE COUNCIL OF CONSTANCE