Kristeva (The Ancestor Cell)

Uncle Kristeva was a member of Faction Paradox notably involved in their invasion of a Gallifrey. (PROSE: The Ancestor Cell) He was one of the Uncles, the Faction's order of assassins. (PROSE: The Gallifrey Chronicles)

Kristeva knew Laura Tobin before her remembrance. (PROSE: The Ancestor Cell)

Nearly three centuries into the future of the War in Heaven, when the surviving Faction had devolved into a militaristic sect, (PROSE: The Gallifrey Chronicles) Kristeva, with Mother Mathara, followed a future version of the Doctor claiming to be Grandfather Paradox, helping him in his plot to invade Romana III's Gallifrey (PROSE: The Ancestor Cell) and launch their own front against the enemy. (PROSE: The Gallifrey Chronicles)

Traveling back in time to before the Event, (PROSE: The Gallifrey Chronicles) Kristeva and his Faction set themselves up in the Eleven-Day Empire sometime before its destruction (PROSE: The Ancestor Cell) in the War's fiftieth year. (AUDIO: The Shadow Play) He presided over the Eleven-Day Empire while Mother Mathara's warfleet invaded Romana's Gallifrey and destroyed its eight cloneworlds.

The Eighth Doctor obliterated Romana's Gallifrey in an attempt to avert the War, destroying the possible Grandfather Paradox and Mathara's fleet. Kristeva and his sect in the Eleven-Day Empire were affected by this, the shock of the event causing them to combust or be attacked by darkened, shadowy birds before dying. (PROSE: The Ancestor Cell)