Brewer's: Robin of Bagshot
Noted for the number of his aliases (see Alias ); but Deeming had nine: viz. Williams, Ward, Swanston, Levey, Lord Dunn, Lawson, Mollatt, Drewe, and Baron Swanston.
“You have as many aliases as Robin of Bag shot.”
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894