Sonnet were invented in Italy in the thirteenth century and became popular when a man by the name of Francesco Petrarch started to write poems in this form for a women he was in love with named Laura. Also, during the English Renaissance, sonnets flourished through the writing of them by poets such as Shakespeare. Sonnets are fourteen lines that have a specific rhythmic pattern and are often about love and romance.

Sample Poem.
Ye ladies, walking past me piteous-eyed,Who is the lady that lies prostrate here?

Can this be even she my heart holds dear?
Nay, if it be so, speak, and nothing hide.
Her very aspect seems itself beside,
And all her features of such altered cheer
That to my thinking they do not appear
Hers who makes others seem beatified.

‘If thou forget to know our lady thus,Whom grief o'ercomes, we wonder in no wise,
For also the same thing befalleth us,
Yet if thou watch the movement of her eyes,
Of her thou shalt be straightaway conscious.
O weep no more; thou art all wan with sighs.
-Trans. D.G. Rossetti