For as long as humans have existed, The Royal families have married their biological relatives to keep their bloodline pure. This practice all marrying a closed biological relative is known as inbreeding. While the idea of marrying a close relative seems just fine on paper, the effects can be quite profound.
Inbreeding can lead to mutations, diseases and defects in the posterity as reported by modern Biological Sciences. for this reason, there have been cases of mutation and defections in Royal families and the dynasties throughout the human history. This necessitates a closer look at those cases of mutations and defections within the Royals.
Poignantly enough, historians are also of the view that inbreeding amongst the Royal families was a major cause behind World War I. All that being said, we has compiled a list of 16 royals who fell victim to inbreeding and as a result who were born defected and mutated.