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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 Pershing Wadlow [February 22, 1918 - July 15, 1940] was a man who, to this day, is the tallest person in medical history for whom there is irrefutable evidence. Wadlow reached 8 feet 11.1 inches in height and weighed 490 pounds [220 kg] at his death. Here we have a photo of him standing next to his father.