Gregor von Muckenberger was a high ranking admiral in the Imperial Fleet in the waning years of the Goldenbaum Empire. For several years he served as commander of the Imperial Fleet stationed at Iserlohn Fortress.
Following the loss of Iserlohn to the Free Planets Alliance fleet led by Yang Wenli, Muckenberger retired from active duty. He did not put his uniform back on during the Imperial Civil War. It should be noted that Mückenberger is the only high-ranking retainer of the Goldenbaum Dynasty to not exit the story by violence or death.