There are two known Guardians of the Authority, Roman Zimojic and Salome Agrippa . They are the guardians of the blood of Lilith and they are in control over the American Vampire League. The Guardian is the leader of the North American Vampires. They can pass laws, and pretty much do as they please. It's known that the older the vampire you are the stronger you are. It would be better if you were a far older vampire than the Authority Chancellor but in Roman Zimojic case, he wasn't. There were far older vampires, he was probably the second youngest vampire. The oldest being Salome Agrippa.