 Apart from use as a pirate base, the islands are believed to have been uninhabited until a penal settlement was established during the British occupation of Java in the early seventeenth century.Archeological finds of Chinese ceramics on the seabed near the islands which date from around the 13th century suggest that the islands were once part of a trade route to Java.The settlement was abandoned by the Dutch during the Java War of 1825–1830, but the former convicts remained as settlers.