The final chapter of Blood of Elves covers the beginning of Ciri's training with Yennefer, learning about magic but also many other things. One passage describes her reading, and I noticed the following sentence:
She read The Adversities of Loving and Time of the Moon, collections of poems by the famous troubadour Dandilion.
Dandilion, of course, is a major character in the whole Witcher series, but he sings and tells stories - I don't recall any mention of him writing them down.
Who collected Dandilion's poems in written form? Was it he himself, or someone who listened to him many times? Is this ever mentioned in the books?