Sultanate of Langkat The Langkat Sultanate is a kingdom that used to rule in the Langkat Regency, North Sumatra now. The Langkat Sultanate became prosperous because of the opening of rubber plantations and the discovery of oil reserves in Pangkalan Brandan. The Langkat Sultanate is the oldest of the Malay monarchies in East Sumatra. In 1568, in what is now called "Hamparan Perak", a high-ranking "Kingdom of Aru" named Dewa Shahdan managed to save himself from the attack of the Sultanate of Aceh and founded a kingdom. This kingdom became the forerunner of the modern Langkat Sultanate. The name Langkat comes from the name of a tree that resembles a langsat tree. The Langkat tree has fruit that is larger than the langsat fruit but smaller than the duku fruit. It tastes bitter and tart. This tree was once often found on the banks of the Langkat River, namely in the lower reaches of the Batang Serangan River which flows through the city of Tanjung Pura. However,
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