Nivet was a technician in the Capitol serving under the War Queen.
Shortly before the the War, Nivet helped repair Compassion. Compassion decided that she liked Nivet and he would be the perfect companion for her due to his skills in repairing TARDISes. Just before the destruction of Gallifrey, Compassion rescued Nivet and together they explored time and space. (PROSE: The Ancestor Cell)