6. 1180: Construction of outer-harbour of Bruges
The return of peace after the Nordic invasions and the restoration of links across the Rhine and with the regions bordering the North Sea reanimated the Low Countries, which were now no longer a 'finis terrae', the end of the earth, but an inhabited area covered with fortified castles and walled towns. Bands of hitherto vagrant merchants settled down near the towns and castles. By mid-eleventh century, the weavers of the flatlands had come to live in the urban centres. The population increased, large agricultural estates prospered, and the textile industry kept workshops busy from the banks of the Seine and Marne to the Zuyder Zee.
It was all to culminate in the goo fortune of Bruges. By 1200, this city, together with Ypres, Thourout and Messines,was included in the circuit of the Flemish fairs. This in itself made Bruges a more important place: she was receiving foreign merchants, her industry was thriving and her trade was reaching England and Scotland where she found the wool needed both for her looms and for re-export to the cloth-making towns of Flanders. Her English contacts also served her well in the provinces of France owned by the king of England: hence her early dealings in Normandy grain and Bordeaux wines. And finally the arrival in Bruges of Hanseatic ships confirmed and developed her prosperity.
The citizens of Bruges built new outer harbours, first at Damme (1180) and later at Sluys at the mouth of the Zwyn: their construction was called for not only by the gradual silting-up of the harbour in Bruges, but also by the need for deeper moorings for the heavy Koggen of the Hanseatic ports.