JK Rowling, the author of one of the world’s most successful series of books, has shared some rejection letters.

The reason? To inspire aspiring writers not to be disheartened by rejections.

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But the gesture goes much further than that.

The letters she shared were actually addressed to her ‘Cuckoo’s Calling’ pseudonym Robert Galbraith,.

But the Harry Potter author also revealed that one publisher she sent the manuscript to, was also the one which rejected Harry Potter when she was first starting out as a writer.

RELATED: THE MOTHER OF THIS GIRL WHO DIED OF CANCER HAD SOMETHING BEAUTIFUL TO SAY TO JK ROWLING

One of the letters reads: “I regret we have reluctantly come to the conclusion that we could not publish it with commercial success.”

Another letter, sent by the Constable and Robinson imprint, gives advice on how to pitch books to a publisher.

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It reads: “At the risk of ‘teaching my grandmother to suck eggs, may I respectfully suggest the following.”

Going on it advises the author to write an “alluring” 200-word blurb about the text, as well as asking a bookshop for which publisher and editor to send it to.

“A writer’s group/writing course may help,” it adds.

The Harry Potter series is one of the best-selling book franchises of all time.

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The Cuckoo’s Calling was written under the Galbraith name, because she said she wanted to be treated like any other author.

It found critical acclaim before it was later revealed that Rowling was the author behind the book.

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JK Rowling recently shared a letter of a very different kind, sent to her from the mother of a girl who died of cancer, which thanked the author for giving both she and her daughter an escape through the Harry Potter series.