The family in question is the habsburgs.
Modern 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.
But while the line was intact this inbreeding caused this royal family to exhibit a number of peculiar physical traits especially one known as the habsburg jaw.
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.
The researchers led by geneticist román vilas from spain s.
A new report at smithsonian takes a look back at one of the most distinctive features of a royal family that once ruled much of europe over the course of several centuries.
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.
This distinctive habsburg jaw a new analysis published in the annals of human biology finds most likely resulted from inbreeding.