Caius Julyan was born in September 1959.
Chat with our AI personalities
He doesn't have one.
Aro's wife, Sulpicia has no known abilities aside from the normal vampire abilities, this goes the same way for Athenodora, Caius's wife.
In New Moon, we are introduced to the Volturi (which, Caius is one of the leaders of). We are also more introduced to the Quileute pack, and what the link is between the vampires and the werewolves. Werewolves are the only thing strong enough to destroy a vampire, besides another vampire. Vampires are basically the only thing that can kill a werewolf because the venom is extremely poisonous to them and kills the wolf instead of transforming them into another vampire. Caius realizes how powerful the Quileute pack is, and that is why he is "afraid" of the wolves.
the volturi members are Aro, Marcus and caius
Stephenie Meyer has not given enough information about Caius (or any other Volturi member, for that matter) for this question to be answered. No one really knows how he did become apart of the Volturi, though it would be interesting to find out.