Poets have been fascinated and challenged by the sonnet ever since it was imported from Italy to England in the 16th century. With its 14 lines, inexhaustibly variable, it has met particular needs of almost every major poet from Thomas Wyatt to Paul Muldoon. Don Paterson - himself an adept of the form - has devised an anthology that is both a sharing of personal favourites and a celebration of high moments in the sonnet's history.