Odin and the North Country Charm against the Night Mare

Robert Graves in his The White Goddess (1948) brings to our attention an ancient charm dating back to at least the 14th century from the North Country which is attributed to Odin:

"The mon o' micht, he rade o' nicht

  Wi' neider swerd ne ferd ne licht.

            He socht tha Mare, he fond tha Mare,

            He bond tha Mare wi' her ain hare,

            Ond gared her swar by midder-micht

            She wolde nae mair rid o' nicht

            Whar aince he rade, thot mon o' micht."

A Christianised version of this charm appears in Shakespeare's King Lear, which I may add is a reference to the Celtic Sea God Llyr (Cymric) or Lir (Irish):

"Swithold footed thrice the wold.

           He met the Night-Mare and her nine-fold,

           Bid her alight and her troth plight,

           And aroynt thee, witch, aroynt thee!"

The charm should be receited nine times or thrice times thrice, both 3 and 9 being sacred numbers in the Northern Tradition.