Dispater was a planet.
In the 26th century, it was owned by Vol Mercurius, who had bought it with money he had stolen from Abslom Daak. Daak went to Dispater to recruit Mercurius to fight the Daleks. They were invading the planet when Daak arrived, which helped convince Mercurius to depart on the Kill-Wagon. (COMIC: Star Tigers)