The first Habsburg who can be reliably traced was a certain Radbot of Klettgau, who was born in the late 10th century; the family name originated with Habsburg Castle, in present-day Switzerland, which was built by Radbot. After 1279, the Habsburgs came to rule in the Duchy of Austria, which was part of the elective Kingdom of Germany within the Holy Roman Empire.

Prognathism 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. In general dentistry, oral and maxillofacial surgery, and orthodontics, this is assessed clinically or radiographically (cephalometrics).The word prognathism derives from Greek πρό …