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Did medieval bowyers heat treat their bows?

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stuckinthemud:
Simple question.  Did medieval bowyers temper war-bows/hunting bows/whatever?  How far back does tempering go?

Chumash:
Hardening wood with fire or heat - the wooden speerpoint, the grave stick - is older then the knowledge of archery, I think.

Hamish:
I can vaguely remember reading that some bowyers put their stave into a bakers oven at the end of the day. Not sure if it was done before working the stave, into a bow, or whether it was done during tillering. I don't know if it was done in Medieval or Renaissance times, or if the reference was more modern, ie 18th/19th century. I can also remember other old  sources saying not to expose it to heat. Toxophilus would be the first book I would check, if I was doing research.
 As most experienced contemporary bowyers know yew doesn't like being too dry, or overly heated, it often leads to violent breaks. Whether the bowyers of the time did it with white woods???. I agree with Chumash. Fire hardening wood goes back to the  stone age, so its very likely craftsmen of the medieval ages were aware and could have employed some such process to maximise performance, especially with white woods.

Del the cat:
I generally try to avoid speculation but:-
I wouldn't think they would bother for warbows because of the time involved and the potential loss of reliability. When I heat treat Yew, I keep the heat off the sapwood. Heavy bows are highly stressed anyway, anything that may weaken the sapwood back is a recipe for disaster. Why would they bother?
Maybe for whitewoods, but not Yew IMO
(I've exploded enough Yew bows to give a considered opinion ;) )
Del

Strelets:
In Toxophilus (1545) Roger Ascham wrote:

"Yet I would desire all bowyers to season their staves well, to work them and sink them well, to give them heats convenient, and tillerings plenty."

So, in the 16th century at least, "heats convenient" were a well-known part of the bowyers craft.

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