^ abK. S. B. Keats-Rohan, 'Alan Rufus (d. 1093)', Oxford Dictionary of National Biography, Oxford University Press, 2004.
^although she inherited the Earldom of Richmond from her father in 1166, Constance did not enter her inheritance until 1183/1184 (see Judith Everard and Michael Jones, The Charters of Duchess Constance and Her Family (1171–1221), p 38)
^Judith Everard and Michael Jones, The Charters of Duchess Constance and Her Family (1171–1221), p 1
^"From Michaelmas 1183, Geoffrey was also in possession of the honour of Richmond", Judith Everard and Michael Jones, The Charters of Duchess Constance and Her Family (1171–1221), p 1
Butler, Lawrence. "The origins of the honour of Richmond and its castles". In Robert Liddiard. Anglo Norman Castles. Woodbridge, Suffolk: The Boydell Press. (2003).
Froissart, John. Sir John Froissart's Chronicles of England, France, Spain, and the Adjoining Countries II. London: Longman, et al. (1806).
Keats-Rohan. "The Bretons and Normans of England 1066–1154" Nottingham Medieval Studies (1992).[1]