The UNSC Pillar of Autumn is a fictional starship from the Halo video game series, specifically known for its role in the Human-Covenant War. It is a Halcyon-class cruiser operated by the United Nations Space Command (UNSC) and is notable for its advanced technology and capabilities in space combat. The ship is best known for its involvement in the events of the first game, Halo: Combat Evolved, where it becomes a key player in humanity's struggle against the Covenant. The Pillar of Autumn is commanded by Captain Jacob Keyes and serves as a pivotal setting for the introduction of the iconic character Master Chief.