Additionally, Colley Cibber and John Rich began to battle each other for greater and greater spectacles to present on stage. The figure of Harlequin was introduced, and pantomime theatre began to be staged. This "low" comedy was quite popular, and the plays became tertiary to the staging. Opera also began to be popular in London, and there was significant literary resistance to this Italian incursion. In 1728 John Gay returned to the playhouse with The Beggar's Opera. The Licensing Act 1737 brought an abrupt halt to much of the period's drama, as the theatres were once again brought under state control.