John Comstock
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John Comstock, the Earl of Epsom, Lord Chancellor, is a fictional character in Neal Stephenson's novel The Baroque Cycle. He is a member of the "Silver Comstocks" who are distantly related to the "Golden Comstocks", of whom Roger Comstock is a member. John Comstock was, in the series, responsible for supplying the English Navy with arms (cannon and powder) against the Dutch during the war.
His grandson, William Comstock, Earl of Lostwithiel, appears in The System of the World, as the owner of a tin-mine and financial backer to Thomas Newcomen's steam engine.