Captain Ravan was a member of the Imperial Guard in Caldeum.
He commanded Guardsman at the gates, keeping people out of the city. Asheara pointed him to the suffering of the people, but Ravan didn't act. However, when she told him that The Nephalem had vital information concerning Alcarnus, Ravan relented, and let The Nephalem in, though stated that he doubted that the emperor would be receptive.[1]
In-game[]
Ravan appears as an NPC in the Caldeum Bazaar, appearing in the quest "A Royal Audience." It is unspecified whether he is a human or Deceiver.