E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
This superstition arose from the belief that magicians had the power of imprisoning demons in rings. The power was supposed to prevail in Asia, and subsequently in Salamanca, Toldo, and Italy.
Magic circles (like magic squares) are mathematical puzzles.
Corcuds ring. This magic ring was composed of six metals, and insured the wearer success in any undertaking in which he chose to embark. (Chinese Tales: Corcud and his Four Sons.)
Dame Linss ring, given by her to Sir Gareth during a tournament. It insured the wearer from losing blood when wounded.
This ring, said Dame Lions, increaseth my beauty That which is green it turns red, and that which is red it turns green. That which is blue it turns white, and that which is white it turns blue. Whoever beareth this ring can never lose blood, however wounded.History of Prince Arthur, i. 146.
Fairy ring (A). Whoever lives in a house built over a fairy ring will wondrously prosper in everything. (Athenian Oracle, i. 307.)
Gyges ring. (See GYGES.)
Luneds ring rendered the wearer invisible. Luned or Lynet gave the ring to Owain, one of King Arthurs knights.
Take this ring, and put it on thy finger, with the stone inside thy hand, and close thy hand upon it. As long as thou concealest the stone, the stone will conceal thee.The Mabinogion (Lady of the Fountain).
Reynards ring. The ring which Reynard pretended he had sent to King Lion. It had three gems: one red, which gave light in darkness; one white, which cured all blains and sprains; and one green, which would guard the wearer from all ills, both in peace and war. (Henrik von Alkmaar: Reynard the Fox.)
The steel ring, made by Seidel-Beckit. It enabled the wearer to read the secrets of anothers heart. (Oriental Tales; The Four Talismans.)
The talking ring given by Tartaro, the Basque Cyclops, to a girl whom he wished to marry. Immediately she put it on, it kept incessantly saying You there, and I here. In order to get rid of the nuisance, the girl cut off her finger, and threw both finger and ring into a pond. (Basque legends.)
This tale appears in Campbells Popular Tales of the West Highlands (i. to iii.), and in Grimms Tales (The Robber and his Sons).