Death cap mushrooms only take 10-15 hours to act, culminating in liver failure and death. Based on scientific understanding of the process, historians believe that these mushrooms were used in Claudius's death at the hands of Julia Agrippina. Poisons were used frequently in the Roman Empire, including arsenic, used for its colorlessness and lack of odor and taste. For a timeline of famous poisonings, read on here.

To attempt foraging in safety, check out guides for safe foraging for beginners here and here. Never forget the cardinal rule, as mentioned in the video: When in doubt, throw it out!