The Travels of Sir John Mandeville was a popular travel guide from the 14th century that described the author's supposed travels throughout Europe, North Africa, the Middle East, and Asia over 30 years. While the historicity of Mandeville himself is uncertain, the book provided geographical information for centuries and influenced explorers like da Vinci and Columbus. It included fantastical tales alongside factual descriptions and promoted religious tolerance of non-Christian peoples with virtuous morals.