The Nuttall Encyclopedia
A title which originally belonged to princes of the Hindu race, who exercised sovereign rights over some tract of territory; now applied loosely to native princes or nobles with or without territorial lordship.
Wood, James, ed. Entry for 'Rajah'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/r/rajah.html. Frederick Warne & Co Ltd. London. 1900.