Opposite words for royal:
uncrowned, crownless, beggarly, poor, slavish, mean, lowborn, servile, contemptible, vile.
Usage samples:
  1. Now the King said to his daughter, at the royal table, " What did all the wild animals want, which have been coming to thee, and going in and out of my palace?"
    "Household Tales by Brothers Grimm", Grimm Brothers.
  2. The bay mare was, she said, altogether more royal.
    "The Adventures of Akbar", Flora Annie Steel.
  3. Harry promised to follow my advice; at the same time he confessed that it made him more anxious than ever to find out who his parents really were, and whether or not they were both on board the Royal George when she went down.
    "The Loss of the Royal George", W.H.G. Kingston.
  4. His Royal Highness took no notice of me on his first arrival, but in a few minutes afterwards, coming up to me: 'Pray, Lady Clermont, ' said he, 'is that man whom I see here Count Fersen, the queen's favourite?
    "Devon, Its Moorlands, Streams and Coasts", Rosalind Northcote.