Indian culture was spread through the Malay Archipelago and Indonesia by traders from the S Indian kingdoms. Meanwhile, Greeks following Alexander had settled in Bactria (in the area of present-day Afghanistan) and established an Indo-Greek kingdom. After the collapse (1st cent. B.C.) of Bactrian power, the Scythians, Parthians, Afghans, and Kushans swept into NW India. There, small states arose and disappeared in quick succession; among the most famous of these kingdoms was that of the Kushans, which, under its sovereign Kanishka, enjoyed (2d cent. A.D.) great prosperity.