Sonnet
It was, however, Sir Philip Sidney's sequence "Astrophel and Stella" (1591) that started the English vogue for sonnet sequences. The next two decades saw sonnet sequences by William Shakespeare, Edmund Spenser, Michael Drayton, Samuel Daniel, Fulke Greville, William Drummond of Hawthornden, and many others. These sonnets were all essentially inspired by the Petrarchan tradition, and generally treat of the poet's love for some woman, with the exception of Shakespeare's sequence of 154 sonnets. The form is often named after Shakespeare, not because he was the first to write in this form but because he became its most famous practitioner. The form consists of fourteen lines structured as three quatrains and a couplet. The third quatrain generally introduces an unexpected sharp thematic or imagistic "turn", the volta. In Shakespeare's sonnets, however, the volta usually comes in the couplet, and usually summarizes the theme of the poem or introduces a fresh new look at the theme. With only a rare exception (for example, Shakespeare's Sonnet 145 in iambic tetrameter), the meter is iambic pentameter.
William Shakespeare
Few details of Shakespeare's sexuality are known. At 18, he married 26-year-old Anne Hathaway, who was pregnant. Susanna, the first of their three children, was born six months later on 26 May 1583. Over the centuries, some readers have posited that Shakespeare's sonnets are autobiographical, and point to them as evidence of his love for a young man. Others read the same passages as the expression of intense friendship rather than romantic love. The 26 so-called "Dark Lady" sonnets, addressed to a married woman, are taken as evidence of heterosexual liaisons.