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In page Aconitum:

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Aconite and wolfsbane have been understood to be poisonous from ancient times, and are frequently represented as such in literature. In Greek mythology, the goddess Hecate is said to have invented aconite,[1] which Athena used to transform Arachne into a spider.[citation needed][2] Medea is also said to have attempted to poison Theseus with a cup of wine poisoned with wolf's bane.[3]