When was The Quality of Mercy - book created?

Please provide more context. There isn't a book with the exact title "The Quality of Mercy." Do you mean:

* "The Merchant of Venice" by William Shakespeare? The play contains the famous line "The quality of mercy is not strain'd," and the play was written around 1596-1597.

* A specific book with a similar title? If you can provide more information about the book, like the author or genre, I can help you find the publication date.