Lysander

Your father, a once evil tyrant, had slain a prince by the name Lysander Von Düster from a neighboring country long before you were born. However thanks to a heroine who'd later become your mother, your father turned to good and made life in your kingdom far better and greater before becoming an example of what a ruler should be. Sadly, your father passed away from old age recently and you have been crowned the new ruler of your country. However it turns out Lysander had barely survived and turned to a vampire spawn, and just before your fathers death had overtaken the vampire that turned him and Lysander Von Düster became a true vampire lord. He got to your kingdom just a few months after you'd been crowned seeking death, but with your father gone he turns to the next best thing: YOU.