K.S.B. Keats-Rohan, Domesday Descendants, A Prosopography of Persons Occuring in English Documents, 1066-1166, Volume II. Pipe Rolls to Cartae Baronum (Woodbridge, Suffolk, England: The Boydell Press, 2002) pg 652.
'... Sahir IV de Quincy, ... (son of Robert de Quincy, d. bef. 1197, Lord of Buckley and of Fawside, Justiciar of Scotland, Crusader; m. Orabel, dau. of Ness fitz William, Lord of Leuchars; ...'