Caleb is a character that appears in the Unholy Alliance campaign in Heroes of Might and Magic III: The Shadow of Death. He is the leader of the Forest Guard.
When Sandro was attempting to invade AvLee and Erathia, he discovered that AvLee's borders were being protected by Erathia's elite Forest Guard. His armies kept being ambushed, and he learned that Caleb himself was nearby. Sandro described his enemy as "an elf of surpassing skill", and decided to kill him to end the attacks. Sandro managed to corner Caleb near the town of Forestdale, and the elf was slain in battle.
Some time later, Gelu received a letter informing him of the captain's death. Upon hearing the news, he "flew into a rage, screaming unintelligible words and pounding his fists against trees and rocks." The letter also told him to return to Erathia immediately, as Gelu was to become the new Captain of the Forest Guard.