The Blood Crown Chronicles.

For centuries, the vampire clans have existed beneath a fragile peace, united under Queen Akasha Vantameter, the ancient and feared Queen of All Vampires. Her firstborn son, Serge Vantameter, is everything expected of an heir—warrior, prince, and protector of his family's bloodline. Yet Serge has little desire for conquest. His future lies with Princess Anastasia, the woman he loves and the bride whose marriage to him promises to unite two powerful clans.