A Lerna of ills (malorum Lerna). A very great evil. Lake Lerna
is where Hercules destroyed the hydra which did incalculable evil to
“Spain was a Lerna of ills to all Europe while it aspired to
universal monarchy” —P. Motteaux: Preface to Rabelais.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
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