the tasks of Hercules, Joan
of Arc, Una, Job, and Little-Red-Riding-Hood."

Who can tell us who "Una" was ?

Una is of course the goddess of coal - known to the Romans as "Anthracite", she has seen fit to grace mortal man and woman with a Board whereon she communes with the faithful:
http://unaboard.coalgoddess.net/

(For the uninitiated: although it is currently and temporarily known as "Cypress Creek" for reasons best known to Una, it is normally called the Unaboard, and is another favoured haunt of Sparteye and me).