As Bruges grew out of the rude fortress on the banks of the Roya, so Ypres developed from a stronghold built, probably about the year 900, on a small island in the river Yperlee. It was triangular in shape, with a tower at each corner, and was at first known by the inhabitants of the surrounding plain as the 'Castle of the Three Towers.' In course of time houses began to appear on the banks of the river near the island. A rampart of earth with a ditch defended these, and as the place grew, the outworks became more extensive. Owing to its strategic position, near France and in a part of Flanders which was constantly the scene of war, it was of great importance; and probably no other Flemish town has seen its defences so frequently altered and enlarged as Ypres has between the primitive days when the Crusading Thierry d'Alsace planted hedges of live thorns to strengthen the towers, and the reign of Louis XIV., when a vast and elaborate system of fortifications was constructed on scientific principles, under the direction of Vauban. The citizens of Ypres took a prominent part in most of the great events which distinguished the heroic period of Flemish history. In July, 1302, a contingent of 1,200 chosen men, '500 of them clothed in scarlet and the rest in black,' were set to watch the town and castle of Courtrai during the Battle of the Golden Spurs, and in the following year the victory was celebrated by the institution of the Confraternity of the Archers of St. Sebastian, which still exists at Ypres, the last survivor of the armed societies which flourished there during the Middle Ages. Seven hundred burghers of Ypres marched to Sluis, embarked in the Flemish boats which harassed the French fleet during the naval fight of June, 1340, and at the close of the campaign formed themselves into the Confraternity of St. Michael, which lasted till the French invasion of 1794. Forty years later we find no fewer than 5,000 of the men of Ypres, who had now changed their politics, on the French side at the Battle of Roosebeke, fighting in the thick mist upon the plain between Ypres and Roulers on that fatal day which saw the death of Philip van Artevelde and the triumph of the Leliarts. [Illustration: ADINKERQUE At the Kermesse.] Next year, so unceasingly did the tide of war flow over the plain of Flanders, an English army, commanded by Henry Spencer, Bishop of Norwich, landed at Calais under the pretext of supporting the partisans of Pope Urban VI., who then occupied the Holy See, against the adherents of Pope Clement VII., who had established himself at Avignon. The burghers of Ghent flocked to the English standard, and the allies laid siege to Ypres, which was defended by the French and the Leliarts, who followed Louis of Maele, Count of Flanders, and maintained the cause of Clement.