Ith, [121], [122];

Ith’s Plain, [66], [122].

Iuchar, son of Tuirenn, [90]-106.

Iucharba, son of Tuirenn, [90]-106.

Iweridd, i.e. “Ireland”, wife of the British sea-god Llyr, [258], [270], [271].

Janus, [383].

Javelin, Red, one of Manannán’s spears, [60], [217].

John, Feast of Saint, [245], [407], [411].

Jones, the Rev. Edward, on apparitions, [391].

Joseph of Arimathea, [358], [359], [366].