That there was an influx of silver dirhams from the Muslim world into eastern and northern Europe in the ninth and tenth centuries is well known, as is the fact that the largest concentration of hoards is on the Baltic island of Gotland. Recent discoveries have shown that dirhams were reaching the British Isles, too. What brought the dirhams to northern Europe in such large numbers? The fur trade has been proposed as one driver for transactions, but the slave trade offers another – complementary – explanation.