Royalism

noun

1. Support of monarchy or of a particular monarch.
2. The principles or cause of royalty; attachment to a royal government or cause.
3. the principles or conduct of royalists.
4. Impassioned allegiance to or advocacy of the establishment, maintenance, and/or interests of a particular king, royal house, or kingly dynasty; sometimes extended to the same of a non-royal (i.e., grand ducal, imperial, or other) family or sovereign; often contrasted with monarchism.
5. adherence or attachment to a monarchy or to the principle of monarchal government