He not only stopped the Turks, he stopped half his own population as well unfortunately, which is probably why he was killed. He didn't seem to distinguish between his enemies and someone who had just slightly displeased him ... they all got the pointy end of his psychosis. Even while incarcerated in Hungary, by all accounts he liked to dismember small animals and impale them on little wooden spikes (and not just on barbecue night). A weird and disturbing dude.
I think the Bathory's were related to him as well, which doesn't surprise me one bit.