Charles Darwin may get the credit for the theory of evolution, but one historian says a Welsh land surveyor gave him the idea!
While the theory of evolution is most closely associated with Charles Darwin, some believe a Welsh scientist has been unfairly overlooked.
Alfred Russel Wallace wrote to Darwin in March 1858 setting out his thoughts on evolution while he was working in Indonesia.
The biologist's idea was strikingly similar to Darwin's own.
But Darwin took the plaudits after On The Origin of Species was published a year later when Wallace was still away.
Now historian and solicitor David Hallmark is championing Wallace's work on the 150th anniversary of the day Darwin received Monmouthshire-born Wallace's letter - 18 June, 1858.
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