The Kingdom of Hungary (Hungarian: Magyar Királyság), also known as the Regency, existed from 1920 to 1946 as a de facto country under Regent Miklós Horthy. Horthy officially represented the Hungarian monarchy of Charles IV, Apostolic King of Hungary. Attempts by Charles IV to return to the throne were prevented by threats of war from neighbouring countries and by the lack of support from Horthy (see the conflict of Charles IV with Miklós Horthy).