E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Clio
was one of the nine Muses, the inventress of historical and heroic poetry.
1
Clio. Addison is so called because his papers in the Spectator are signed by one of the four letters in this word, probably the initial letters of Chelsea, London, Islington, Office. (See NOTARICA.)
2
See Professor Morleys Introduction to the Spectator, on the subject.