Agrippina

Agrippina was a human colony planet in the Tiberian spiral galaxy (PROSE: Ghost in the Machine) which was attacked by the Eleventh Cyber Legion during the Cyber-Wars. (PROSE: Ghost in the Machine, A Girl Called Doubt) Its capital city was Agrippina Primus. (PROSE: A Girl Called Doubt)

In one timeline, the Doctor died on Agrippina during the Cyber-Wars and billions of Cybermites attempted to convert the Doctor's TARDIS. A war was fought between the TARDIS systems and the mites, leading to the TARDIS swelling to the size of a planet after its chameleon circuit was shut down. (PROSE: The Paradox Moon)