Ponten VI

From Tardis Wiki, the free Doctor Who reference

Ponten VI or Ponten Six was the planet where the Guild of Adjudicators was based in the 22nd century. It was ceded to them in perpetuity by Earth Central. Bishop trained there for five years. (PROSE: Lucifer Rising)

By the 30th century, the Guild was based on Ponten IV. (PROSE: Original Sin)