Ascalante is an outlaw, who leads raids against caravans in the deserts surrounding Aquilonia. He used to be the count of Thule, but his lands were forfeited and he sunk to his status as an outlaw. After one such raid, he took the powerful sorcerer Thoth-amon (though stripped of his powers) as a slave, and continued to blackmail him into servitude yet he reveals the hiding and powerless sorcerer's identity to his enemies.
He appears in The Phoenix on the Sword, where he is a central figure in a plot against the newly crowned king, Conan. He was approached by Dion, Volmana, Gromel, and Rinaldo months prior to the events of the stories, when the "Rebel Four" sought him out in the deserts to organize their scheme to assassinate Conan and declare Dion the new king. Unbeknownst to his co-conspirators, Ascalante secretly planned to turn against his partners after the coup, and declare himself the new king. After meeting with his fellow schemers for the last time before the plot springs into motion, Ascalante dispatches Thoth-amon to watch over Dion, whom Ascalante doesn't entirely trust to keep his cool and not foil the plot at the last minute. When it times come to initiate the coup, Ascalante leads the assassins through the halls of Conan's palace, confronting the king in his bed-chamber. Over the course of the fighting, Ascalante issues commands to his men, engaging Conan at the end of the fight, when the king is badly wounded and surrounded. However, at that moment, a creature summoned by Thoth-amon to kill his master charges into the chamber and pins Ascalante to the ground. Ascalante comes face-to-face with the beast and is filled with horror at the monster's demonic face, before being torn into by the creature's fangs.
Ascalante is described as tall and lean, and posses an egotistical and cynical personality. He is highly confident in his own abilities, and treats others as his lessors. He physically abuses his slave, Thoth-amon, and views his fellow conspirators as nothing more than his own tools.