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     Johnson's brightest prospect of income,  when setting off for London in 1737, was to get his tragedy Irene produced, but it would take more  than a decade for that to occur. Irene is based on an episode related in Richard Knolles's 1603 The Generall Historie of the Turkes, and tells the story of the  Turkish Sultan Mahomet (Mehmed II, 1432-1481) falling in love with a Greek  woman, Irene, at the siege of Constantinople. Although the play was  substantially completed by 1741, Johnson continued to revise it, as this manuscript  shows. David Garrick, having taken over the management of the Drury Lane  Theater, was able in 1749 to give his friend's play a fairly successful  nine-night run, providing Johnson with nearly £200 in much-needed income. 
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