The question I was asked is this would you consider Count Dracula and the Blood Countess tyrants?
No, I would not. For one thing Count Dracula is a character in a novel, and since they were referring to the countess of the blood, I would also say no.
However, if they were referring to two people Vlad Tepes and Elizabeth Bathory (known as Vlad Dracul, and Elizabeth Bathory sometimes known as Countess of Transylvania-- her husband being a Count, after her infamous killing she was known as the blood countess.)
book 100 tyrants, which both are found in. While I agree that Vlad Tepes was a warlord and could be considered a tyrant, I am not so sure about a serial killer, who is reported to have killed around 600 young girls for their blood.