TIL that Charles V, Holy Roman Emperor had an extramarital sexual relationship with his own step-grandmother, Germaine de Foix, who was one of his many mistresses. Charles later married his first cousin, Isabella of Portugal. His sister, Eleanor, married Isabella’s father and her uncle, King Manuel.

Read more: https://en.wikipedia.org/wiki/Charles_V,_Holy_Roman_Emperor#Marriage_and_private_life

What do you think?


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  1. I still don’t understand this and cousin marriages are still prevalent today in certain cultures/religious groups. In denial that birth defects can be attributed to this practice.

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