Chagan, the capital of Tang became an international city with envoys and merchants from West Asia and India, and various kinds of commodities and knowledge were spread to Japan and East Asia from Chagan.
唐の都の長安は西アジアやインドからの使節や商人が集まる国際都市となり、長安を中心にさまざまな商品や知識が日本を始め東アジア各地に広まっていった。