This is a list of Bohemian monarchs or a list of Czech monarchs who ruled the Czech lands (known in English as Bohemia prior to early 20th century) from the establishment of the Duchy of Bohemia in 870 (from 1004 to 1806 a part of Holy Roman Empire), as Kingdom of Bohemia from 1212, and in 1620-1918 as a part of Austria-Hungary. Following the dissolution of the monarchy, the Czech lands became part of Czechoslovakia, and form today's Czech Republic since 1993.