Which of these men did not marry a person who was his first cousin?

Pff I wouldn't want to marry any of my cousins!

Quite surprising for a man who realized an incestuous relationship would cultivate inbreeding.

WalksBySelf, "fifth cousin" means two people sharing great-great-great-great-grandparents in the same way (first) cousins share grandparents. "Twice removed" means that there is a two generation difference between the people being referred to - the grandchild of my cousin is twice removed from me. Simple - lol.

Fifth cousin twice removed! What does that even mean?

Edgar Allan Poe also married his first cousin for 11 years, she was 13 when they got married.

Player: Coco, Genetic problems due to inbreeding is overemphasized. Near relatives are not recommended, but even first cousins are generally ok. Although, today, not recommended.