Os Lusíadas
The Twelve of England (in Portuguese: Os Doze de Inglaterra) is a Portuguese chivalric legend of 15th-century origin, famously related by the poet Luís de Camões in his 1572 "Os Lusíadas" (Canto VI). It tells the story of twelve Portuguese knights who travelled to England at the request of twelve English ladies to avenge their insult by a group of English knights.