Iestyn, [38]

Innocent, Pope, [58]

Iolo Goch, [100-102], [124], [163], [208], [234], [283], [309]

Iolo Morganwg MSS., [245], [281], [294]

Isabel, daughter of Glyndwr, [105], [129]

Isabella of France, [126]

J

Janet Crofts, Glyndwr’s daughter, [105]

Jevan ap Meredith, [254]

Joan, wife of Llewelyn II., [56], [60], [62]