Luís Vaz de Camões is considered Portugal's and the Portuguese language's greatest poet. His mastery of verse has been compared to that of Shakespeare, Milton, Vondel, Homer, Virgil, and Dante. He wrote a considerable amount of lyrical poetry and drama, but is best remembered for his epic work Os Lusíadas. The influence of his masterpiece Os Lusíadas is so profound that Portuguese is sometimes called the "language of Camões". The day of his death, 10 June, is Portugal's national day.