Everything hasn't been said about RCCL & RCI.
Until 1997 RCCL was the name of the company, and stood for "Royal Caribbean Cruise Line".
In 1997, when they bought Celebrity Cruises...
- the company's name became Royal Caribbean International, RCI
- RCCL became Royal Caribbean Cruises Ltd, Miami-based owner of the two cruise brands (RCI and Celebrity)
"Royal Celebrity" doesn't exist! But there is a new brand called "Royal Celebrity tours" which offfers land-tour programs throughout Alaska for RCI and Celebrity guests.
Hope this helped