Royal suites can often signify that royalty have stayed at that suite in the past. Royal suites are more common in hotels in countries with monarchies, such as the Ritz Hotel London.
A very small number of hotels have both a presidential and a royal suite. In these instances, usually both suites are of a comparable size and price, but differ in style and facilities. Royal suites may be more classically furnished, while presidential suites may be more modern in appearance. Presidential suites may have facilities such as a private conference room, while royal suites may have a formal reception room instead.
People sometimes reside in these suites on a permanent basis, such as wealthy families that enjoy this type of suite in a semi-private manner for special rates.
See also
State room, referring to rooms reserved for the head of state in large mansions