Aukon was originally Science Officer Anthony O'Connor of the Hydrax before serving the Great Vampire as one of Three Who Rule.
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After the Hydrax accidenally left N-Space and passed into E-Space, along with the three, Aukon ruled the un-named planet in E-Space as an advisor to Zargo and Camilla. The Three Who Ruled kept the population of the planet in thrall for a thousand years. Aukon and the others died when the Doctor launched one of the shuttles into the heart of the Great Vampire. Like the others, he aged to death and decayed. (DW: State of Decay)