Turns out marrying cousins over and over can cause some unfortunate genetic conditions to come to the forefront.
Habsburg jaw modern day.
The family in question is the habsburgs.
It is characterized by a jutting lower jaw that is often accompanied by an abnormally thick lower lip and sometimes a tongue that is abnormally large.
While both inbreeding and the habsburg jaw have always been associated with the house of habsburg there had never been a scientific study that had conclusively linked incest with the family s notorious facial feature.
The researchers were interested in mandibular prognathism perhaps better known as the famous habsburg jaw this was a facial deformity that affected some of the habsburgs notably including king.
Modern science has proved that the habsburg chin is related to inbreeding though why it manifests itself in some offspring but not all continues to remain a mystery.
The habsburg dominions around 1200 in the area of modern day switzerland are shown as habsburg among the houses of savoy zähringer and kyburg the progenitor of the house of habsburg may have been guntram the rich a count in the breisgau who lived in the 10th century and forthwith farther back as the medieval adalrich duke of alsace from the etichonids from which habsburg derives.
Charles ii of spain and the habsburg jaw also called the habsburg lip and the austrian lip the habsburg jaw is a physical condition known by the modern term mandibular prognathism.
Prognathism also known as the habsburg jaw is a positional relationship of the mandible or maxilla to the skeletal base where either of the jaws protrudes beyond a predetermined imaginary line in the coronal plane of the skull.
Was this feature a physical sign of the divine right of kings.
The smithsonian article by lila thulin offers up a very different explanation.
Besides their long stints in the thrones of numerous countries they re also known for the distinctive habsburg jaw.
This distinctive habsburg jaw a new analysis published in the annals of human biology finds most likely resulted from inbreeding.
Modern research on the habsburg jaw wikimedia commons holy roman emperor charles v a 16th century leader of the house of habsburg and a notorious example of the habsburg jaw.