Rooinga or Rohingyas, The Natives of Arakan, were there centuries before the First British Annexation of Burma Empire (1824).
Asiatic Researches (Volume V.), Calcutta, AD 1799.
Rohingya were long settled in Rakhang or Arakan way before the British first annexed Rakhaing or Arakan in AD 1826.
Francis Buchanan (1799) A Comparative Vocabulary of Some of the Languages Spoken in the Burma Empire. Calcutta, pp. 237-239.