Hieroglyphics of Horapollo: Book I: LX. How a Vigilant King
Hieroglyphics of Horapollo, tr. Alexander Turner Cory, [1840]
And otherwise to denote a vigilant king, they depict the SERPENT (UPON THE WATCH), and in the place of the king's name they depict a watcher: for he is the guardian of the whole world; and the king ought to be vigilant everywhere.