In Geoffrey of Monmouth's Historia Regum Britanniae, Igerna enters the story as the wife of Gorlois, Duke of Cornwall.

[3] Layamon says "Uther greeted Ygaerne, noblest of wives, and sent her token what they had spoken in bed; he commanded her that she should give up the castle quickly – there was no other way, for her lord was dead.

"[2] Malory has Arthur, who had been raised by Sir Ector, meet his mother for the first time after he had grown to manhood and become king.

[4] According to Geoffrey, Igraine also bore a daughter to Uther Pendragon: Arthur's full sister Anna, the future mother of Gawain and Mordred.

[1] Igraine is indirectly mentioned several times in the 11th/12th-century Welsh text Culhwch and Olwen as the unnamed mother of Arthur.

[7] When combined with the two previous sources, the Brut Dingestow suggests that Arthur's mother was named Eigyr.

Around 1400, Glastonbury monks modified the genealogies to make the Maimed King either Igraine's grandfather or great-grandfather through Amlawdd Wledig.

Richard Carew's Survey of Cornwall (1602), drawing on earlier sources, mentions a sister of Arthur called Amy born to Igerna and Uther.

Bosigran promontory fort in Zennor parish, Cornwall, was suggested by Henry Jenner to mean 'the Dwelling of Igerna'.

Jenner also noted the proximity of Bosigran to Bosworlas (in St Just parish) 'the Dwelling of Gorlois',[12] who he believed was a real petty-chief in fifth or sixth-century Dumnonia.