Premise: Robert Levet (1705–1782), a Yorkshireman who became a Parisian waiter, then garnered some training as an apothecary and moved to London, was eulogised by the poet Samuel Johnson, with whom Levet shared a friendship of thirty-six years, in Johnson's poem "On the Death of Dr. Robert Levet."
Hypothesis: Samuel Johnson met Robert Levet in the 1750's.