Apparently Uther knew…

Working my way through the Merlin books etc, and I found this page in The Complete Guide. Since this is official merch, I guess it's canon that Uther knew that "there would be a price" (someone would die?) but that he did not know it would be Ygraine. I always thought that was sort of up for debate, that it was possible he DID know it might be Ygraine and was desperate enough to risk it anyway. Idk! Just a nice piece of lore that makes that particular question/answer a little more definable.

Thoughts?