Herbaer Argoll

 was a male admiral who served in Death Squadron on-board the Imperator-class Star Destroyer Impregnable. He participated in numerous conflicts as admiral, though his discontent with Vader's usage and treatment of the Death Squadron eventually led to his defection to the Rebellion. He assisted in numerous naval operations thereafter, including the decisive victory at the Battle of Endor.

Early years (24 BBY — 5 BBY)
Argoll was born on Metellos to a middle-class family. His father was a shipyard builder, while his mother operated as a mechanic. Although he had no desire to pursue the occupations of his parents, Argoll had basic understanding of how ships operate as he approached adulthood.

In order to save money, Argoll enlisted himself in the Imperial navy as an officer cadet at the Metellos Sector Academy. He graduated at the rank of lieutenant and was assigned to the planetary defense fleet over Ralltiir. Argoll was placed under the command of Vice-Admiral Gredge.

Imperial service (5 BBY — 3 ABY)
At the time of the Subjugation of Ralltiir, Argoll was a captain and commanding officer of the Victory-class Star Destroyer Dominance.