Criminal Law (Ireland) Act, 1828

Plea of not guilty, without more, shall put the prisoner on his trial by jury.

7. Whenever any person, not having privilege of peerage, being arraigned upon any indictment for treason, felony, or piracy, shall plead thereto a plea of not guilty, such person shall, by such plea, without any further form, be deemed to have put himself or herself upon the country for trial, and the court shall, in the usual manner, order a jury for the trial of such person accordingly.