in Germany, according to tradition, is so called from the Lindwurm or dragon slain by Siegfried under the linden tree.
Yet more I know of Seigfried that well your your ear may hold. Beneath the lindeu tree he slew the dragon bold; Then in its blood he bathed him, which turned to horn his skin, So now no weapon harms him, as oft hath proven been.
Nibelungen, st. 104.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894