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Indeed, GWR only knows of 10 confirmed or reliable cases in history of humans reaching 8 ft or more. Sultan first became the world's tallest living man in 2009, when he measured 246.5 cm (8 ft 1 in) in height. He took the title from Xi Shun (China, b. 1951), who measured 2.361 m (7 ft 8.95 in) in height when measured in 2005.
Robert Wadlow is the world's tallest man at 8 feet 11 inches. Robert Pershing Wadlow (1918 - 1940) was and is the tallest human being ever recorded. He reached 8' 11.1 (272 cm) in height and 490 pounds (222.26 kg) in weight before his death at the age of 22. His height was due to an overactive pituitary gland. Robert Wadlow was born in Alton, Illinois on February 22 1918.