Os Lusíadas
The legend of the "Twelve of England" was famously related by Portuguese poet Luís de Camões in his 1572 epic poem "Os Lusíadas". In Canto VI, Stanzas 40-69, while Vasco da Gama's fleet was crossing the Indian Ocean, a soldier named Fernão Veloso regales his fellow Portuguese sailors with the story of the "Twelve of England" to pass the time and inspire their bravery.