Vermuellen was a Koviri Prince, duke of Creyden and the head of intelligence in Kovir. He married Gaudemunda Thyssen who bore him a son, Guiscard Vermuellen.

According to the Wiedźmin: Gra Wyobraźni, Koviri prince Aristide Vermuellen, duke of Creyden, was head of intelligence in Kovir. His secret service cooperate with dvarvish banks of Vivaldi and Cianfanelli.

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