Thank you so much for all your replies. It is certainly an interesting subject, raising the possibility of descent from William the Conqueror. I mentioned my correspondence with Roddy MacDonald. I have just unearthed what he sent me in 2000 (16 years ago). What I received was not really a family tree, more a relationship chart. It is headed "Kinship of Duncan MacIntyre, Reverend" (this is my husband's g.g.g. grandfather, Reverend Duncan MacIntyre of Killmallie Parish, Lochabar (Invernesshire?). Reverend Duncan was the son of Margaret MacIan MacDonald and her husband, John MacIntyre of Camusnaherie (on Loch Leven near Ballachulish). Reverend Duncan married Jean MacIntyre, daughter of James MacIntyre of Glen Noe (on Loch Etive near Oban). James was designated 3rd Chief of Clan MacIntyre. This relationship chart from Roddy is 24 pages long and makes fascinating reading. On page 18 is listed "Normandy, William Conqueror of England, King, December, 1027 - 21st great-grandfather" that is, 21st g. grandfather of our Reverend Duncan MacIntyre. Other Normandys are listed, including "Richard I, The Fearless of, Duke, 974 A.D. 23rd g. grandfather" and William I, Longsword of, Duke abt 891 A.D. 25th g. grandfather".
Other fascinating entries and the kinship to Rev. Duncan are:-
"Olafson, Magnus 3, Barelegs of Norway, King 1073 A.D., half first cousin 21 times removed" (I guess by the time you get to the half first cousin, 21 times removed, the bloodline is a bit diluted!!)
MacKenneth, Malcolm 2 of Scots, King about 954, A.D., 24th g. grandfather"
MacSorley, Dugal of Lorne, King before 1164 A.D., 17th great-granduncle"
Plantagent, Henry 2 of England, King 25 March, 1133, half first cousin, 20 times removed"
MacConstantine, Donald 2 of Scots, King before 877 A.D., 27th great-grandfather.
According to Roddy, there are also a lot of Vikings hanging on the branches of our family tree - Thorn, Skull Cleaver of Orkney, Helgo the Lean, Rognvald the Wise, Halfdan the Black, Olaf the Sharp Sighted, Richard the Good, Infiald the Wicked, Heakon the Imperious, Haakon the Mighty, Ljot the Renegade and Thorstein the Whistler. This is all wonderfully exciting but I would still like confirmation about our descent from William!! from Aurora.