Marquis Robert de la Cheyniest
During the servants' meal, it is mentioned that the Marquis's grandfather was a Rosenthal - the same last name as Dalio had in "Grand Illusion". I wonder if the two characters were supposed to be related to each other, perhaps the Marquis was the son of the Lieutenant. The Lieutenant did have a family who owned an estate, but I don't remember if where the Rosenthals supposedly originated in each film.
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