The marquess was the executor of her husband's estate.
The book tells it is wrong, so what's the wrong with?
A marquess is a man. His wife is called a marchioness. Th term 'executor' refers to a man.
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A marquess is a man. His wife is called a marchioness.
Th term 'executor' refers to a man. A woman is called an executrix.
I wouldn't exactly say you are learning very useful English!