Cortana (Halo 1)
![Picture](/uploads/8/2/7/0/8270409/2206473.jpg)
Cortana, UNSC Artificial Intelligence serial number CTN 0452-9, is a"smart" A.I. construct, or "Intelligent Agent". She was one of the most important figures in the Human-Covenant War, and served as John-117's partner in various combat missions, as well as serving as the A.I. for the United Nations Space Command Halcyon-class Cruiser UNSC Pillar of Autumn and the Orbital Defense Platform Cairo Station. In addition, she held vital data pertaining to the Halos, including the Activation Index from Installation.