William Cecil Headrick (1904-1995) was a descendant of Elizabeth Hill Carter (1731-1760), who was a descendant of William the Conqueror, Ælfred the Great of Wessex and Charlemagne, as these images show to confirm the data from another source:

SOURCE:
https://famouskin.com/pedigree.php?name=22747+richard+evelyn+byrd&ahnum=1