The fall of the Roman empire and the succeeding Dark Ages brought instability to Western Europe and a near-collapse of the trade network in the western world. Trade, however, continued to flourish among the kingdoms of Africa, the Middle East, India, China, and Southeast Asia. Some trade did occur in the west. For instance, Radhanites were a medieval guild or group (the precise meaning of the word is lost to history) of Jewish merchants who traded between the Christians in Europe and the Muslims of the Near East.