From royal +‎ -ize.

royalize (third-person singular simple present royalizes, present participle royalizing, simple past and past participle royalized)

1. (transitive) To make royal or royalist.
   • c. 1593 (date written), William Shakespeare, “The Tragedy of Richard the Third:[…]”, in Mr. William Shakespeares Comedies, Histories, & Tragedies[…] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC, [Act I, scene iii]:

     Ere you were queen, yea, or your husband king,
     I was a pack-horse in his great affairs;
     A weeder-out of his proud adversaries,
     A liberal rewarder of his friends:
     To royalize his blood I spilt mine own.

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     1660 February, John Milton, The Ready and Easy Way to Establish a Free Commonwealth, and the Excellence thereof, Compar’d with the Inconveniencies and Dangers of Readmitting Kingship in this Nation; republished in A Complete Collection of the Historical, Political, and Miscellaneous Works of John Milton,[…], volume I, Amsterdam [actually London: s.n.], 1698, →OCLC, page 80:

     […] nor let the new royaliz’d presbyterians perswade themselves that thir old doings, though now recanted, will be forgotten […]

2. (transitive, obsolete) To make famous, to glorify, to celebrate.
   • c. 1587–1588 (date written), [Christopher Marlowe], Tamburlaine the Great. […] The First Part[…], 2nd edition, part 1, London: […] [R. Robinson for] Richard Iones,[…], published 1592, →OCLC; reprinted as Tamburlaine the Great (A Scolar Press Facsimile), Menston, Yorkshire; London: Scolar Press, 1973, →ISBN, Act II, scene iii:

     For fates and Oracles, heauen haue ſworne,
     To roialiſe the deeds of Tamburlaine:
     And make them bleſt that ſhare in his attemptes.