Final answer:
Alexander Pope invented the heroic couplet, which dominated English poetry.
Step-by-step explanation:
The inventor of the heroic couplet, which dominated English poetry for a long time, was Alexander Pope. A heroic couplet is a rhyming pair of lines in iambic pentameter. Pope's mastery of this form is seen in his works, such as his poem 'Essay on Criticism' which extensively uses the heroic couplet.