Behind the large square of the Halles, from which the Belfry rises, is the Rue du Vieux Bourg, the street of the Ouden Burg, or old fort; and to this street the student of history must first go if he wishes to understand what tradition, more or less authentic, has to say about the earliest phases in the strange, eventful past of Bruges. The wide plain of Flanders, the northern portion of the country which we now call Belgium, was in ancient times a dreary fenland, the haunt of wild beasts and savage men; thick, impenetrable forests, tracts of barren sand, sodden marshes, covered it; and sluggish streams, some whose waters never found their way to the sea, ran through it. One of these rivulets, called the Roya, was crossed by a bridge, to defend which, according to early tradition, a fort, or 'burg,' was erected in the fourth century. This fort stood on an islet formed by the meeting of the Roya with another stream, called the Boterbeke, and a moat which joined the two. We may suppose that near the fort, which was probably a small building of rough stones, or perhaps merely a wooden stockade, a few huts were put up by people who came there for protection, and as time went on the settlement increased. 'John of Ypres, Abbot of St. Bertin,' says Mr. Robinson, 'who wrote in the fourteenth century, describes how Bruges was born and christened: "Very soon pedlars began to settle down under the walls of the fort to supply the wants of its inmates. Next came merchants, with their valuable wares. Innkeepers followed, who began to build houses, where those who could not find lodging in the fort found food and shelter. Those who thus turned away from the fort would say, 'Let us go to the bridge.' And when the houses near the bridge became so numerous as to form a town, it kept as its proper name the Flemish word _Brugge_." [Illustration: BELL-RINGER PLAYING A CHIME] The small island on which this primitive township stood was bounded on the south and east by the Roya, on the north by the Boterbeke, and on the west by the moat joining these two streams. The Roya still flows along between the site of the old burg and an avenue of lime-trees called the Dyver till it reaches the end of the Quai du Rosaire, when it turns to the north. A short distance beyond this point it is vaulted over, and runs on beneath the streets and houses of the town. The Rue du Vieux Bourg is built over the course of the Boterbeke, which now runs under it and under the Belfry (erected on foundations sunk deep into the bed of the stream), until it joins the subterranean channel of the Roya at the south-east corner of the Market-Place. The moat which joined these two streams and guarded the west side of the island was filled up long ago, and its bed is now covered by the Rue Neuve, which connects the Rue du Vieux Bourg with the Dyver.