Poisons or the World History of Poisoning(2001)

A story of an actor named Oleg whose wife has been seduced by his neighbor. As he is thoroughly convinced of her infidelity, he would like to poison her. An old man named Prokhorov helps him to get rid of his wife by lecturing about famous deaths caused by poisoning. It is from Prokhorov we learn that many famous and not so famous like Cesare Borgia and Caligula were killed as they were poisoned.