Mr Whyte, 70, who left Scotland over 50 years ago to lives in Canada, believes the only surviving example of Wallace’s seal provides supporting evidence.
It appears on The Lubeck Letters which he sent to the German city in 1297, a month after his victory at the Battle of Stirling Bridge, to inform European traders that Scotland was still open for business.
Mr Whyte said: “The seal shows his personal emblem is a long bow. There, I thought, is the evidence that Wallace was a bowman.
“When you dig into the research, it shows he worked for his uncle Malcolm Wallace of Elderslie, Renfrewshire, and that he was a woodsman, the medieval equivalent of gamekeeper. He was accused of poaching and outlawed, so he spent much of his youth hiding in Selkirk forest.
“So here’s this guy, an outlaw, a bowman, living in a forest, who has a girlfriend called Mirren, which is Scots for Marion. She is abducted and supposedly killed, as suggested in the film Braveheart, by the Sheriff of Lanark, William Heselrigg.”
“You don’t have to be a genius to add up two and two and get Robin Hood. And I firmly believe that this man, as a young man, was the archetype from which the legend of Robin Hood grew.”