Published in 1609, the Sonnets were the last of Shakespeare's non-dramatic works to be printed. Scholars are not certain when each of the 154 sonnets was composed, but evidence suggests that Shakespeare wrote sonnets throughout his career for a private readership. Even before the two unauthorised sonnets appeared in The Passionate Pilgrim in 1599, Francis Meres had referred in 1598 to Shakespeare's "sugred Sonnets among his private friends".