E. Cobham Brewer 1810–1897. Dictionary of Phrase and Fable. 1898.
Hercules Secundus.
Com’modus, the Roman Emperor, gave himself this title. He was a gigantic idiot, of whom it is said that he killed 100 lions in the amphitheatre, and gave none of them
more than one blow. He also overthrew 1,000 gladiators. (161, 180–192.)
