House of Visconti

[Koen G]

Like you, I accept the datation of Carbon14 and the estimation of the years of 1404 and 1438 for this manuscript.
That means that the VM was written after the oldest date, 1438.

I don't understand why Valentina Visconti, who died in 1408, should be the writer of this mysterious manuscript.

But if the range you accept is 1404 to 1438, doesn't that mean that the vellum could have been made and inscribed in 1404? Wouldn't that leave a window of at least three full years for someone who died in 1408 to have written the manuscript?

I don't support any Visconti hypothesis since I think the current manuscript was copied much more than authored, but I don't see anything unscientific about a posited date of creation between 1404 and 1408.