I belive it was his sonnets.
The original quarto of Shakespeare's Sonnets was published in 1609 by Thomas Thorpe. The absence of the customary author's dedication or benediction - and other evidence associated with the poems - suggest, however, that Shakespeare was not a party to the publication process.
No. 1564 - 1616
Shakespeare's sonnets were first published in their entirety in this year. However, there is good reason to believe that Shakespeare was not responsible for the publication, not least of which is the fact that the dedication is not signed by Shakespeare, but by the publisher.
William Shakespeare
After 1564, when he was born, and before 1609, when it was published. That's all we know.
Shakespeare's sonnets was created in 1609.
They are the poems numbered 1- 154 in the book, Shakespeare's Sonnets, published in 1609 plus a few included within the script of a number of his plays.
Shakespeare didn't publish any sonnets. He wrote 154 sonnets which were all published during his lifetime but they were never published by him. Two of them were published in a volume called The Passionate Pilgrim by Isaac Jaggard in 1599. All 154 were published in a volume called "Shake-speare's Sonnets" in 1609 by one Thomas Thorpe.
Venus and Adonis was published in 1593 and The Rape of Lucrece in the following year. The sonnets were published in 1609, by Thomas Thorpe.
1609
There are many debates over William Shakespeare. There are people who theorize that William Shakespeare, was not actually William Shakespeare. These people believe that William Shakespeare was a noble of high birth, who was using the name William Shakespeare to publish writing. There's also the belief that William Shakespeare was actually several different people writing under the name of William Shakespeare. Ultimately, there's no hard evidence to suggest that William Shakespeare was anyone other than William Shakespeare. So the answer is "YES, William Shakespeare was a real writer."
Shakespeare's Sonnets were published in 1609 for the first time. Also Quarto editions of Pericles, Romeo and Juliet and Troilus and Cressida.
1609