Prince of Bohemia, in love with Perdita. (Shakespeare: Winter's Tale.)
George the Fourth, when prince, corresponded under this name with
Mrs. Robinson, actress and poet, generally known as Perdita, that being
the character in which she first attracted the prince's attention. Prince Florizel,
in Lord Beaconsfield's novel of Endymion
(1880), is meant for Napoleon III.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894