Ivory had been a staple trade item from the coast of East Africa since before the Christian era. But growing world demand in the 19th century, together with the provision of increasingly efficient firearms to hunters, created a moving "ivory frontier" as elephant herds near the coast were nearly exterminated. Leading large caravans financed by Indian moneylenders, Arab traders based in Zanzibar reached Lake Victoria by 1844. One trader, Ahmad bin Ibrahim, introduced Buganda's kabaka to the advantages of foreign trade: the acquisition of imported cloth and, more important, guns and gunpowder. Ibrahim also introduced the religion of Islam, but the kabaka was more interested in guns.