Hi
There is no historical record of a Walter de Izat and records at the Tower of London do not show the execution of anybody by that name.
The opinion of myself and other members of my family is that this was a ficticious tale, written sometime in the 19th Century. However this is only an opinion and if anybody can show positive proof of his existance then we would be more than happy to re-consider.
We have traced the Izat side of the family back to the early 1700's and possibly late 17th century but have not established any connection to the Izatts of Utah - yet.
Regards,
John Izat