The Grand Duke de Guldenhorf (Großherzog von Guldenhorf) is the father of Beatrice and the ruler of the Grand Duchy de Guldenhorf. The Guldenhorf family is quite wealthy and had lent money to both the Gramonts and Montmorencys. He did not participate in the campaign against Albion, allowing him to preserve his army.[1]
He is known to be wary of Mazarin and de La Vallières.[2]