Claim: John Blackwall was a British naturalist born in January 20, 1790 in Manchester.
Evidence: John Blackwall (20 January 1790 – 11 May 1881) was a British naturalist with a particular interest in spiders. Blackwall was born in Manchester on 20 January 1790. 
John Blackwall (20 January 1790 – 11 May 1881) was a British naturalist with a particular interest in spiders. (1790-01-20)January 20, 1790
Manchester