=Invisible Knight= (_The_), Sir Garlon, brother of King Pellam (nigh of kin to Joseph of Arimathy). “He is Sir Garlon,” said the knight, “he with the black face, he is the marvellest knight living, for he goeth invisible.”—Sir T. Malory, _History of Prince Arthur_, i. 39 (1470). =Invisibility= is obtained by amulets, dress, herbs, rings, and stones. _Amulets_: as the capon-stone called “Alectoria,” which rendered those invisible who carried it about their person.—_Mirror of Sornes._ _Dress_: as Alberich’s cloak called “Tarnkappe” (2 _syl._) which Siegfried got possession of (_The Nibelungen Lied_); the mantle of Hel Keplein (_q.v._); and Jack the Giantkiller had a cloak of invisibility as well as a cap of knowledge. The helmet of Perseus of Hadês (_Greek Fable_) and Mambrino’s helmet rendered the wearers invisible. The _moros musphonon_ was a girdle of invisibility.—Mrs. Centlivre, _A Bold Stroke for a Wife_. _Herbs_: as fern-seed, mentioned by Shakespeare and Beaumont and Fletcher. _Rings_: as Gyges’s ring, taken from the flanks of a brazen horse. When the stone was turned inwards, the wearer was invisible (Plato). The ring of Otnit, king of Lombardy, according to _The Heldenbuch_, possessed a similar virtue. Reynard’s wonderful ring had three colors, one of which (the green) caused the wearer to be invisible (_Reynard the Fox_, 1498); this was the gem called heliotrope. _Stones_: as heliotrope, mentioned by Boccaccio in his _Decameron_ (day viii. 3). It is of a green hue. Solīnus attributes this power to the _herb_ heliotrope: “Herba ejusdem nominis ... eum, a quocumque gestabitur, suptrahit visibus obviorum.”—_Geog._, xl. =Invulnerability.= Stones taken from the cassan plant, which grows in Pauten, will render the possessor invulnerable.—Odoricus, _In Hakluyt_. A dip in the river Styx rendered Achillês invulnerable. Medea rendered Jason proof against wounds and fire by anointing him with the Promethe´an unguent.—_Greek Fable._ Siegfried was rendered invulnerable by bathing his body in dragon’s blood.—_Niebelungen Lied._ =Ion=, the title and hero of a tragedy by T. N. Talfourd (1835). The oracle of Delphi had declared that the pestilence which raged in Argos was sent by way of punishment for the misrule of the race of Argos, and that the vengeance of the gods could be averted only by the extirpation of the guilty race. Ion, the son of the king, offered himself a willing sacrifice, and as he was dying, Irus entered and announced that “the pestilence was abating.” =Io´na’s Saint=, St. Columb, seen on the top of the church spires, on certain evenings every year, counting the surrounding islands, to see that none of them have been sunk by the power of witchcraft. As Iona’s saint, a giant form, Throned on his towers conversing with the storm ... Counts every wave-worn isle and mountain hoar From Kilda to the green Ierne’s shore [_from the Hebrides to Ireland_]. Campbell, _The Pleasures of Hope_, ii. (1799).