The Consul to the Supreme Tribunal was a title of the ruler of the Galactic Empire.
Behind the scenes[]
In the initial, rough draft of Star Wars, the Consul is Cos Dashit, who is also entitled Lord of Alderaan. In the first draft, he is named Son Hhat and is also Lord of Granicus. The characters are identical in all other respects.
At one point in both scripts, a "High Consul" is aboard the space fortress to witness the imprisonment of Annikin Starkiller. It is not clear if this is the same man, but the context suggests that the title applies to Darth Vader or Valorum (aka Dodona), as he is to be sent to the Imperial/Royal capital for his execution before the Galactic ruler. This inconsistency may be explained if one of these courtiers was also entitled Consul (there were two in ancient Rome and during the Consulate in France), and was therefore not a unique title.