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Captain Jacob Keyes is a character from Halo: Combat Evolved. He is considered to be one of the must notable skillful commander in the UNSC's Navy. He was born in earth and have a daughter, Commander Miranda Keyes, who plays a role in Halo 2. He is the Captain of the human Starship, the Pillar of Autumn. He remains on the ship in the first level of the game, Reville, and survives the crash. The Captain, in Halo 1, plays an integral part to the plot playing out as it does. After the crash of the Pillar of Autumn, the captain is taken hostage by the Covenant and held captive aboard the Covenant Cruiser, Truth and Reconciliation.
On the Third level of Halo: Combat Evolved, you and a team of Marines assault the Truth and Reconciliation to rescue the captain. The captain elects to stay behind though, once you get to the shuttle bay to leave the Covenant Ship.
Later on in the game, Master Chief and Cortana discover that they need the captains authorisation codes to return to the Pillar of Autumn and destroy it to destabilise Halo. So, upon returning to the Truth and Reconciliation, Master Chief and Cortana make the chilling discovery that the Captain has fallen victim to the Flood and has been turned into a Proto-Gravemind, tasked with the flight of the Truth and Reconciliation. Fortunately, The Chief destroys the Proto-Gravemind, retrieves the captain's neural implant, and ends the Captain's undue suffering all in one fell swoop.
Later on in the game, in the level "Keyes", you find out that the Captain has been transformed into a Flood monster and you must kill him to retrieve a data chip from his body.