Centuries of inbreeding among European royals caused the deformity

The House of Habsburg produced various Austrian and Spanish kings and queens - and they occupied the throne of the the Holy Roman Empire from 1438-1740.

Inbreeding Caused the Distinctive 'Habsburg Jaw' of 17th Century Royals That Ruled Europe

Deformities of the Hapsburgs

16 Royals Who Suffered From Hereditary Mutations And Defects Caused By Inbreeding

Inbreeding in the Spanish Royal Family, by Catherine Rasgaitis, Counter Arts

History's most famous chin officially linked to centuries of inbreeding

What is the Habsburg jaw? - Quora

Centuries of inbreeding among European royals responsible for famous facial deformities seen in historical paintings

The Habsburg Jaw and Other Royal Inbreeding Deformities - Owlcation

Habsburg Family Deformities

How inbred are Europe's monarchs? [OC] : r/dataisbeautiful

The Habsburg Jaw: The Royal Deformity Caused By Centuries Of Incest