The mother of the Roman Emperor Charlemagne was also known as Bertha Broad... what?

Bertrada of Laon (born between 710 and 727 – 12 July 783), also known as Bertrada the Younger or Bertha Broadfoot, was a Frankish queen. She was the wife of Pepin the Short and the mother of Charlemagne, Carloman and Gisela.

Bertrada's nickname "Bertha Broadfoot" dates back to the 13th century, when it was used in Adenes Le Roi's trouvère "Li rouman de Berte aus grands piés". The exact reason that Bertrada was given this nickname is unclear. It is possible that Bertrada was born with a clubfoot, although Adenes does not mention this in his poem. The nickname might have been a reference to an ancient legend about a Germanic goddess named Perchta, to real and mythological queens named Bertha, or to several similarly-named Christian queens. Many myths and legends exist in Europe and Asia, in which clubfooted people are described as the link between the world of the living and the spirit world.