Cortana

"Quando il gioco è finito, il re e il pedone vanno nella stessa scatola."

- Cortana's first words. Translates from Italian to: When the game is over, the king and pawn go into the same box.

Cortana was a UNSC "smart" AI originally created for Operation: RED FLAG near the end of the Human-Covenant War. She participated in the climactic battles of the conflict including on Alpha and Delta Halo, Earth, and The Ark.