The walls of the city were to be still further demolished, and the sovereign reserved the right to specify later which towers, gates and walls should be torn down to erect the citadel. Finally, a heavy money indemnity was exacted, and the following day a new code of laws in sixty-five articles was promulgated--the famous Concession Caroline--which served as the basis of government until the end of the old régime during the French Revolution. The city, no doubt, breathed a sigh of relief that the Emperor exacted no further toll of human life, but the conditions were none the less heavy enough. In brief, these terms ended, once and for all, every vestige of self-government, and swept away all of the privileges for which the burghers had fought for so many centuries. The year 1540 marks the end, therefore, of the long and brilliant history of the Flemish communes--for no other city dared resist the Emperor's authority after this--and thereafter Flanders became a mere province in the wide dominions of sovereigns who seldom visited its cities and frequently did not even speak the language of its people. Among the tombstones in the Cathedral of St. Bavon one that deserves more than a passing glance is that of Bishop Triest. Designed by the celebrated sculptor, Jerome Duquesnoy, it is a notable example of Flemish sculpture, besides possessing an added interest by reason of the fact that the artist sought to destroy it when complete. More important, however, than the monument and its story is the fact that Bishop Triest was the father of the art of horticulture for which Ghent is so renowned today. It was in his gardens--which were famous throughout the seventeenth century--that rare and exotic plants were for the first time planted out of doors in Flanders and trained to grow in the form of pyramids, arches, summer-houses, and a hundred fantastic shapes. The "Belvedere Gardens" of the worthy prelate became the model for other gardeners, and the seed, planted in fertile soil, from which sprang a great industry. Not content with cultivating his own gardens the Bishop sought to encourage in every way the humble gardeners of the city, giving them his august protection, his friendly counsel, making loans to the needy, and uniting them into a society under the patronage of St. Amand and Ste. Dorothy. This noble example was speedily followed by the city, which also encouraged the horticulturists. In 1640 William de Blasère, an alderman of the city, constructed the first hothouse ever seen in Europe. It was a hundred feet long, made of wood and glass, heated with huge stoves, and sufficiently high to accommodate the exotic plants that, in summertime, were set outdoors. This novelty made a great stir and brought many visitors to Ghent. Soon afterward a society of horticulturists was founded, and by the end of the century a botanical garden was established.