Mithradates, the subject of Adrienne Mayor's excellent book, THE POISON KING, became legendary for not only taking Rome down a peg or two, but for surviving countless assassination-via-poisoning attempts throughout his lifetime. How’d he do it? By imbibing just a little bit of poison every day until his body got used to it. In modern terms, he built up a tolerance, which made him seem indestructible.
The story kept nagging at me. Where had I heard something similar? And then it came to me.
Before there was this: