The Diet of Hungary or originally: Parlamentum Publicum / Parlamentum Generale (Hungarian: Országgyűlés) became the supreme legislative institution in the medieval kingdom of Hungary from the 1290s, and in its successor states, Royal Hungary and the Habsburg kingdom of Hungary throughout the Early Modern period until the end of World War II. The name of the legislative body was originally "Parlamentum" during the Middle Ages, the "Diet" expression gained mostly in the Early Modern period. It convened at regular intervals with interruptions from the 12th century to 1918, and again until 1946.