In another way they aided this good work by carrying off the robber baron in large numbers to Egypt and Syria, and killing him there. In this way they did much toward ridding European society of its most turbulent elements; while at the same time they gave fresh development to the spirit of romantic adventure, and connected it with something better than vagrant freebooting.[321] By renewing the long-suspended intercourse between the minds of western Europe and the Greek culture of Constantinople, they served as a mighty stimulus to intellectual curiosity, and had a large share in bringing about that great thirteenth century renaissance which is forever associated with the names of Giotto and Dante and Roger Bacon. [Footnote 320: "It is difficult for the modern traveller who ventures into the heart of Asia Minor, and finds nothing but rude Kurds and Turkish peasants living among mountains and wild pastures, not connected even by ordinary roads, to imagine the splendour and rich cultivation of this vast country, with its brilliant cities and its teeming population." Mahaffy, _The Greek World under Roman Sway_, London, 1890, p. 229.] [Footnote 321: The general effects of the Crusades are discussed, with much learning and sagacity, by Choiseul-Daillecourt, _De l'Influence des Croisades sur l'etat des peuples de l'Europe_, Paris, 1809.] [Sidenote: The Fourth Crusade.] There can be no doubt that in these ways the Crusades were for our forefathers in Europe the most bracing and stimulating events that occurred in the whole millennium between the complicated disorders of the fifth century and the outburst of maritime discovery in the fifteenth. How far they justified themselves from the military point of view, it is not so easy to say. On the one hand, they had much to do with retarding the progress of the enemy for two hundred years; they overwhelmed the Seljukian Turks so effectually that their successors, the Ottomans, did not become formidable until about 1300, after the last crusading wave had spent its force. On the other hand, the Fourth Crusade, with better opportunities than any of the others for striking a crushing blow at the Moslem, played false to Christendom, and in 1204 captured and despoiled Constantinople in order to gratify Venice's hatred of her commercial rival and superior. It was a sorry piece of business, and one cannot look with unmixed pleasure at the four superb horses that now adorn the front of the church of St. Mark as a trophy of this unhallowed exploit.[322] One cannot help feeling that but for this colossal treachery, the great city of Constantine, to which our own civilization owes more than can ever be adequately told, might, perhaps, have retained enough strength to withstand the barbarian in 1453, and thus have averted one of the most lamentable catastrophes in the history of mankind.