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.
Oxfordian theory of Shakespeare authorship
Oxford was born in 1550, and was between 40 and 53 years old when he presumably would have written the sonnets. Shakespeare was born in 1564. Even though the average life expectancy of Elizabethans was short, being between 26 and 39 was not considered old. In spite of this, age and growing older are recurring themes in the Sonnets, for example, in Sonnets 138 and 37. In his later years, Oxford described himself as "lame". On several occasions, the author of the sonnets also described himself as lame, such as in Sonnets 37 and 89.