Sir William Davenant (1606-1668)--Poet Laureate and English Civil War hero--is one of the most influential and neglected figures in the history of British theater. He introduced "opera," actresses, scenes, and the proscenium arch to the English stage. Narrowly escaping execution for his Royalist activities during the English Civil War, he revived theatrical performances in London, right under Oliver Cromwell's nose. Davenant was known to boast over...