Of the effects of the Crusades I shall only mention those which are directly illustrated by the story of Chartres. They rolled back the tide of Mahometan conquest from Constantinople; they brought together East and West, and led to the awakening of the human intellect which was to put an end to the dark ages; they opened up new markets and stimulated trade to a wonderful degree--these great results they had, but they only affected Chartres indirectly. More directly we see the effect of them in the relations between the powers that were. By weakening the resources and influence of the barons they strengthened the authority of the Kings acting in alliance with the citizens. And this alliance broke up the feudal system, gradually abolished serfdom, and substituted the authority of a common law for the unstable will of chiefs, whose arbitrament was private war. Last and not least permanent of the effects of the Crusades was the influence exercised by the East upon art. The Porche Royal of the Cathedral, and the stained glass windows which are the glory of Chartres, would not have been as they are had Peter the Hermit never led his hundred thousand pilgrims to destruction, or if Bohémond, Prince of Antioch, had not taken the Cross in the sanctuary of Notre-Dame. The foundation of the Abbey Josaphat-Lès-Chartres, which, like so many other religious foundations rich in lands, in relics and in books, was destroyed in 1789, affords another example of the indirect influence of the Crusades upon the institutions of Chartres. This abbey[48] was situated about two kilometres from Chartres, under the Hill of Lèves, on a site which in its topographical relations resembled that Valley of Jehosaphat to which its founder, Bishop Geoffrey, the successor of S. Ives, had vowed to go, but came into the bishopric instead. Even so S. Bernard recalled the town of Tyre to the memory of all Christians in the name of Tyron, which he gave to the monastery which he founded in Le Perche on lands given to him by S. Ives.