Gilles de Rais is historical vamp 3, who was a comrade in arms to the French warrior Joan of Arc. I'm still on the fence about whether or not this guy was a real vampire, but he was hanged for abusing and killing hundreds of children. Mwa ha ha.
Gilles de Rais (a French nobleman) is considered to be the precursor to the modern serial killer. Before he began his killing spree, he rode as a military captain in the army lead by St Joan of Arc – though it is unlikely that she knew him. He was accused and ultimately convicted of torturing, raping and murdering dozens, if not hundreds, of young children, mainly boys.