Aceh
Sultanate of Aceh

The Sultanate of Aceh was established by Sultan Ali Mughayat Syah in 1511.

In 1584–88 the Bishop of Malacca, D. João Ribeiro Gaio, based on information provided by a former captive called Diogo Gil, wrote the "Roteiro das Cousas do Achem" (Lisboa 1997) – a description of the sultanate.

Later, during its golden era, in the 17th century, its territory and political influence expanded as far as Satun in southern Thailand, Johor in Malay Peninsula, and Siak in what is today the province of Riau. As was the case with most non-Javan pre-colonial states, Acehnese power expanded outward by sea rather than inland. As it expanded down the Sumatran coast, its main competitors were Johor and Portuguese Malacca on the other side of the Straits of Malacca. It was this seaborne trade focus that saw Aceh rely on rice imports from north Java rather than develop self sufficiency in rice production.

After the Portuguese occupation of Malacca in 1511, many Islamic traders passing the Malacca Straits shifted their trade to Banda Aceh and increased the Acehnese rulers' wealth. During the reign of Sultan Iskandar Muda in the 17th century, Aceh's influence extended to most of Sumatra and the Malay Peninsula. Aceh allied itself with the Ottoman Empire and the Dutch East India Company in their struggle against the Portuguese and the Johor Sultanate. Acehnese military power waned gradually thereafter, and Aceh ceded its territory of Pariaman in Sumatra to the Dutch in the 18th century.

By the early 19th century, however, Aceh had become an increasingly influential power due to its strategic location for controlling regional trade. In the 1820s it was the producer of over half the world's supply of black pepper. The pepper trade produced new wealth for the sultanate and for the rulers of many smaller nearby ports that had been under Aceh's control, but were now able to assert more independence. These changes initially threatened Aceh's integrity, but a new Sultan Tuanku Ibrahim, who controlled the kingdom from 1838 to 1870, reasserted power over nearby ports.

Under the Anglo-Dutch Treaty of 1824 the British ceded their colonial possessions on Sumatra to the Dutch. In the treaty, the British described Aceh as one of their possessions, although they had no actual control over the sultanate. Initially, under the agreement the Dutch agreed to respect Aceh's independence. In 1871, however, the British dropped previous opposition to a Dutch invasion of Aceh, possibly to prevent France or the United States from gaining a foothold in the region. Although neither the Dutch nor the British knew the specifics, there had been rumors since the 1850s that Aceh had been in communication with the rulers of France and of the Ottoman Empire.
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