It's labeled "Markree Wensleydales Wool Products 100% Handmade in Ireland." On the back, there is a handwritten notation that says: "Glowing Embers 2010. Long staple, Lamb's Wool. Made by Mary Cooper. 90 grm 96 yards approx. £18 -- 00."
I just got an email back from Emily, in response to my thank-you note, which gave more information about the yarn:
"The yarn came from the Castle that we stayed in - http://www.markreecastle.ie/
"A husband and wife own the Castle Hotel, and the wife makes the yarn from sheep at the Castle. They are a special breed of sheep that are bred for their long wool.
"She has an Etsy shop too: http://www.etsy.com/shop/
And she sent this picture of where the wool was being sold:
So now I have the complete story of my handspun wool!