More on O'riel from Infoplease:

• O'riel - O'riel A fairy whose empire lay along the banks of the Thames, when King Oberon held his court ...
• Kensington - Kensington O'beron, king of the fairies, held his royal seat in these gardens, which were ...
• Dictionary of Phrase and Fable: O - Definitions, origins, and illustrative excerpts for words, phases, and literary allusions starting with "O"