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.