Aidan Savage is over 800 years old. He and his twin brother Julian were born with the last name Selvaggio and they took the English equivalent Savage as their surname when they moved to an English-speaking country. He lives in San Francisco with his loyal servants, Stefan and Marie.
In Dark Sentinel, we learn that Aidan was attacked and injured in much the same way Andor had been, and is currently healing. Due to heavy vampire activity in New York, Aidan is moving there to cut down on their numbers, and perhaps setting up a strong hold there.