He doesn't have one.
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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.
from Carlisle & Esme
The Role in the 2007 version is played by Jamie Campbell Bower who is also in new moon as Caius which is the man with blonde hair in the volturi he is also in harry potter as Gellert Grindelwald
Caius Julyan was born in September 1959.
1st quarter moon . . . 7.38 days after New Moon Full moon . . . 14.77 days after New Moon 3rd quarter moon . . . 22.15 days after New Moon New Moon . . . 29.53 days after the previous New Moon.