4. Charles Darwin
All natural selection jokes aside, the man who popularized the theory of evolution married his first cousin Emma Wedgwood. They had a total of ten children. Darwin died in 1882.
3. Edgar Allan Poe
At the age of 20 poet Edgar Allen Poe moved in with his aunt, uncle, and cousin after his father left and his mother had died. It was there in Baltimore that he met his seven year old cousin Virginia, who he fell in love with and married when she was only thirteen. She died eighteen years later in 1847, and Poe died only two years after Virginia’s death.