The era which followed this crisis was one of great prosperity for Bruges, then a vast emporium of European trade, being in close relation with London, Genoa, Venice, Augsburg and the Hanseatic towns. Wealth abounded. The rich foreign merchants built sumptuous mansions, several of which still exist. Bruges attained the height of its prosperity in the 15th century, under Burgundian rule. Favoured by the long reign of Philippe-le-Bon, "the Great Duke of the West", the arts, today the glory of the old city, flourished exceedingly. Decadence set in, chiefly owing to the retreating of the sea and the gradual filling up of the creeks and harbours with sand. Trade steadily declined, whilst in the 16th century, political and religious troubles hastened the downfall of the city. The population of 200,000 dwindled away to 50,000, and at last the place came to be known as "Bruges-la-Morte". [Illustration: +Bruges. The Governor of Flanders and the Burgomaster of the City welcoming King Albert, Queen Elizabeth and Prince Leopold in the Grand'Place.+] Under the Republic and the Empire, the city, under French domination, became the capital of the Department of the Lys, and later, under Dutch rule (1815-1830), of Western Flanders. When, later, the kingdom of Belgium was constituted, it retained this rank. Since that time, Bruges with her melancholic chimes has remained a quiet old-world place, the delight of lovers of art, who each year come to admire her treasures, amid the charm of quaintly picturesque scenery. The boundaries of the city have remained unchanged since the time when Bruge's prosperity was at its height. The area of the town being the same as in the 14th century, it follows that the present-day population of 50,000--all that remains of the former 200,000 inhabitants--has plenty of elbow-room. However, the numerous open spaces and gardens in no way detract from the æsthetic appearance of the place. In shape an oval, stretching from the south-west to the north-east, the town is surrounded by ramparts and a wide exterior moat, except on the north (between the Gates of Ostend and Damme) where they were demolished at the beginning of the present century, in order to connect up directly with the new ship canal. Parts of the ramparts have been transformed into boulevards, promenades and gardens. Of the numerous windmills which used to form a picturesque girdle round the city, only two, situated near the Sainte-Croix Gate, remain.