'Mr O'Brien, the Irish Giant, the Tallest Man in the Known World', 1803. Artist: John Kay

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'Mr O'Brien, the Irish Giant, the Tallest Man in the Known World', 1803. Patrick O'Brien (c1765-1804), the Irish giant, being measured for a suit by an Edinburgh tailor. O'Brien was 8 feet 7 inches () tall. Such abnormal growth manifested by those suffering from Gigantism is caused by an over-active pituitary gland (endocrine system) producing an excess of growth hormone.

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Size: 3458px × 5050px
Location: World,Europe,United Kingdom,Scotland,Edinburgh,Edinburgh
Photo credit: © Oxford Science Archive/Heritage Images / Alamy / Afripics
License: Licensed
Model Released: No

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