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John Guest (1722-1787) was a brewer, farmer and coal merchant
1722 Born in Broseley, Shropshire.
1767 He was appointed manager of the Dowlais Ironworks on 30 April 1767. He built his first house at Morlais Brook, Gellifaelog but, isolated from his family, became a "lonely and melancholy man". He discovered coal on Lewis's property and used it to replace charcoal for smelting.
By 1767, Guest had moved most of his family to Dowlais.
1782 Became a partner in the Ironworks 
1787 November 25th. Death of John Guest