The Kingdom of Hungary ( short form : Hungary ) , which existed from 1000 to 1918 , and then from 1919 to 1946 , was a considerable state in Central Europe . The Kingdom of Hungary emerged in 1000 , when the Principality of Hungary , founded in 896 , was recognized as a Kingdom . The form of government was changed from monarchy to Republic briefly in 1918 and again in 1946 , ending the Kingdom and creating the Republic of Hungary .