Under his vision and guidance carpet weaving in Isfahan flourished. However the Afghan invasion dealt a serious blow to this industry which it never recovered from until the beginning of the 20th century. Some early pieces created in the last century can be found which consist of 500.000 knots-1.000.000 knots/m2, however these are rare and few in number. World war I brought a change in “modern” Isfahan which was the center of weaving for the fashion industry of Iran. The change of fashion in the world also influenced Iran, causing Isfahan to lose its lucrative fabric industry. However, the shrewd businessman of Isfahan decided to utilize the fine quality wool in fabrics and "aba"’s (woollen cloaks) into high quality Persian rugs which again reestablished Isfahan as a base for one of the finest and most beautiful carpets of Iran. Some Isfahani rugs became known in Western Europe as "Polish rugs" or "Polonaise rugs". This name refers to carpets woven with silk, golden and silver threads in Persia during the 16th-18th centuries and exported to the Polish-Lithuanian Commonwealth. They were commissioned by wealthy Polish noblemen and decorated with their coats of arms. Some of them were later resold to West European buyers who were often convinced of their Polish origin, hence their name.