Aristide[1] Vermuellen was a Kovirian prince and Duke of Creyden who also served as the head of intelligence for his father-in-law King Esterad Thyssen. He married Gaudemunda Thyssen who bore him a son, Guiscard Vermuellen.[2]
His intelligence service was known to cooperate with several dwarven banks including those of Vivaldi and Cianfanelli.[1]