Yes, indeed. They're called many names, vampire counts, the pillars of vampire society, the king's trusted families, super vampires.
They have many names that the masses give them, but they are better known as:
The Four Clans of Vampire Counts.
Being only one rank below the king, they are an essential part of vampire society, and, being an essential part of vampire society, they have important duties that are divided into four main subjects.
Military defense, war, economic affairs, and domestic affairs.
The Adrasteia Clan, located in the West, is responsible for military defense. They are the king's shield. They are a strong warrior clan specializing in the art of warfare. Despite holding an important position like this, their Clan is located in a very remote area, and they are very far from the royal capital.