Ivo, bishop of Chartres. [Letter to Matilda of Scotland, queen of the English, 1107 or later] in Patrologiae cursus completus. Series Latina (Patrologia Latina) 162: 177

[Letter from Ivo, bishop of Chartres, to Matilda of Scotland, queen of the English]
Ivo agrees to pray for the soul of Matilda’s brother, king Edgar of Scotland, who died in 1107, and in the attempt to praise her brother without making his own function superfluous makes some curious remarks about the state of souls after death.
Online at Epistolae, (Duplicate). (See also Bibliographia record).