Islam is reported to have reached Aceh between the seventh and eighth centuries AD and the first Islamic kingdom, Perlak was established in 804 AD. Then followed Samudera Pasai in 1042, Tamiah in 1184, Aceh in 1205 and Darussalam in 1511. In this year the Portuguese captured Malacca and many Asian and Arabic traders sought to avoid the Malacca Strait and called instead on Aceh's port, bringing wealth and prosperity. Aceh's dominance in trade and politics in northern parts of Sumatra began, reaching a climax between 1610 and 1640.
With the death of Sultan Iskandar Thani in 1641, Aceh's decline began. The British and Dutch both started to vie for influence. In 1824 the London Treaty was signed, giving the Dutch control over all British possessions in Sumatra in return for a Dutch surrender of their establishments in India and an abrogation of all claims on Singapore. The Dutch fought a long drawn out struggle in their attempt to subdue the Acehnese. The Aceh War, which lasted intermittently from 1873 to 1942, was the longest ever fought by Holland and cost the Dutch more than 10,000 lives. This struggle has stamped a deep imprint on the Acehnese outlook and mentality.
The era of industrialization arrived, and with it has come a more open attitude towards things alien. Visitors should keep in mind, though, that the Acehnese take their religion, their manners and their morals seriously.
Source : Indonesia-Tourism.com