Learn about Vlad III (Vlad Tepes… “Vlad the Impaler”) and incorporate how Bram Stoker used this person as a basis for his novel. Tell how Vlad Tepes would make the fictional Dracula run away in fear. Read up about Vlad Tepes and you shall see that it is true.
Tell a bit about his real life, how he was the first person in known history to use psychological warfare very effectively. Tell about his atrocities but also tell of the reasons behind them. Tell about how he spent his youth in Turkish dungeons but impressed the Turks enough for them to release him… their folly. Vlad Tepes took what they taught him in those dungeons, distilled it, and used it against them.
Make it a mix between the real man and the mythological Dracula. If you dug into the story behind the real man, trust me, they would be riveted to their seats, their attention completely on you.
I have a deep respect for the man and, if you wish, I can give you some sources to read from. He is considered both a hero and a devil in Romania to this day.