Duchy of Ferrara ended in 1597.
Duchy of Ferrara was created in 1264.
Duchy of Silesia ended in 1918.
Duchy of Zator ended in 1919.
Duchy of Limburg ended in 1794.
Duchy of Friuli ended in 828.
Duchy of Württemberg ended in 1806.
Duchy of Oels ended in 1884.
Duchy of the Archipelago ended in 1579.
Duchy of Bytom ended in 1498.
Duchy of Nysa ended in 1850.
Duchy of Masovia ended in 1526.
Duchy of Sora ended in 1796.