The Marquess of Bath is a man. The current (8th) Marquess is one Ceawlin Thynn, born in 1974. His wife, Emma, nee McQuiston, is the Marchioness of Bath.
Ah, blame me being an American who has never given a crap about royalty or nobility, living or dead ... and there’s no magic in old Hollywood or old DC either (in fact we didn’t need so many federal monuments to national glory until the process of kicking the Constitution to the curb in favor of Arbitrary government was well underway, especially after FDR oozed his way across history).