It's no secret that J.K. Rowling's Harry Potter and the Philosopher's Stone was rejected by a dozen publishers in the 1990s before Bloomsbury picked it up, but now the author revealed some of the rejection letters she received for her first novel in the Cormoran Strike series, The Cuckoo's Calling.

While encouraging fans and aspiring writers to continue to craft their work, the author revealed two letter she - or rather, Robert Galbraith - received about The Cuckoo's Calling when rejecting the chance to publish it.

One of them, Constable and Robinson, funnily enough is owned by Little Brown UK, who actually DID end up publishing The Cuckoo's Calling and all future novels in the Strike series. The other publisher shown below is Creme De La Crime.

By popular request, 2 of @RGalbrath's rejection letters! (For inspiration, not revenge, so I've removed signatures.) pic.twitter.com/vVoc0x6r8W

— J.K. Rowling (@jk_rowling) March 25, 2016

Yes, the publisher who first turned down Harry also sent @RGalbraith his rudest rejection (by email)! https://t.co/22Jwf2u8hy

— J.K. Rowling (@jk_rowling) March 25, 2016

I wasn't going to give up until every single publisher turned me down, but I often feared that would happen. https://t.co/bMKu4zJ3nm

— J.K. Rowling (@jk_rowling) March 25, 2016

The Potter ones are now in a box in my attic, but I could show you @RGalbraith's? 😉 https://t.co/McGYViYvqp

— J.K. Rowling (@jk_rowling) March 25, 2016

I pinned my 1st rejection letter to my kitchen wall because it gave me something in common with all my fave writers! https://t.co/ZmGNWDdF7x

— J.K. Rowling (@jk_rowling) March 25, 2016

Little Brown will also be the U.K. publishers of the upcoming Harry Potter and the Cursed Child script book this summer.

Pre-order the Harry Potter and the Cursed Child script book hardcover text on Amazon.com, Amazon.co.uk and WBShop now.