In many countries, marriage between relatives is considered illegal and even dangerous for the offspring, because couples whose blood is related, give birth to children with poor health, sometimes with serious pathologies, and even mutations.
Nevertheless, this kind of marriages take place, and quite often they happen among world renowned people.
Igor Stravinsky, a great Russian composer who married his own cousin in 1906, despite resistance of church and relatives.
The 32nd US leader is known no less than George Washington and Abraham Lincoln.
Despite his mother's prohibition, Franklin Roosevelt, married his distant relative Eleanor anyway. This marriage gave birth to 6 children.
Johann Sebastian Bach is another great composer who chose his cousin as his wife. They lived together for only 13 years. Johann became a widower with 4 children on his hands. The couple had seven kids, but three of them died in infancy.
Thomas Jefferson is another American president, leading the US from 1801 to 1809. He is known as a co-author of the Declaration of Independence. In 1772, Jefferson married Martha Wales Skelton, she was his third cousin.
During their life as a couple, six children were born. Unfortunately, the marriage ended with Martha's death. Thomas hasn't married again, so his daughter became the first lady.
Herbert Wells, famous for his fantastic creations, married in 1891. His chosen one was his cousin, Isabella Mary. But this marriage lasted only 4 years, whereupon Herbert and Mary got divorced, and the writer married his student.
Albert Einstein - a brilliant and famous scientist - was also married to his sister. And in his case, the marriage was more than amazing: Elsa was a relative both on the maternal and on the paternal line.
Charles Darwin hardly needs a presentation. His choice can also be considered amazing: he married his cousin Emma. A whole dozen of offsprings were born in this marriage, although three of them did not survive. The remaining seven kids were chronically ill and were rather weak.
As a scientist, Darwin suspected that the reason for their sicknesses was a consequence of their parents being close relatives.