Sir Henry Fynes - Clinton , third son of the second Earl .
On his death the dukedom became extinct while he was succeeded in the earldom by his distant relative , the eighteenth Earl , a descendant in the tenth - generation of the Hon .
Sir Henry Fynes - Clinton , third son of the second descendant .
On his death the dukedom became extinct while he was succeeded in the earldom by his distant relative , the eighteenth Earl , a descendant in the tenth - generation of the Hon .