The Doctor names various other beings from the same time as The Infinite including the Nestenes (Spearhead from Space, Terror of the Autons, "Rose", "The Pandorica Opens"), the Great Vampires (State of Decay) and the Racnoss, ("The Runaway Bride"), all of which he has met.
The Doctor compares Baltazar to Napoleon Bonaparte, Boudica, and Blackbeard.