Acehnese–Portuguese conflicts were the military engagements between the forces of the Portuguese Empire, established at Malacca in the Malay Peninsula, and the Sultanate of Aceh, fought intermittently from 1519 to 1639 in Sumatra, the Malay Peninsula or the Strait of Malacca. The Portuguese supported, or were supported, by various Malay or Sumatran states who opposed Acehnese expansionism, while the Acehnese received support from the Ottoman Empire and the Dutch East India Company.