Konig (King) Philip II of Spain, c. 1556 by Pompeo
Leoni (1533?-1608) - Bust in Terracota by Balthasar Moll (1717-1785) - Kunsthistorisches Museum, Vienna, Austria.
Note: the large lower maxilla, mandible or jaw is prominent, particularly the chin
or menton (medically referred to as prognathia). This bony overgrowth is cause by a
single autosomal (sex independent) gene mutation that affected many members (about
50% of descendants of an affected parent - baring non-paternity) of the royal Habsburg
family.
Other portraits of members of the Habsburg royal house also reveal prognathism
(see illustrations | A | B | C |).