The 5th Parliament of Great Britain was summoned by George I of Great Britain on 17 January 1715 and assembled on the 17 March 1715. When it was dissolved on 10 March 1722 it had been the first Parliament to be held under the Septennial Act of 1716. The composition of the new House of Commons represented a massive Whig landslide victory at the election, reversing the pro-Tory landslide of the previous election, with 341 Whigs and 217 Tories. Spencer Compton, 1st Earl of Wilmington, the Whig member for Sussex, was installed as Speaker of the House of Commons.