Duchy of Warsaw was created in 1807.
Duchy of Warsaw ended in 1813.
Duchy of Warsaw.
Duchy of Württemberg was created in 1495.
Duchy of Veragua was created in 1537.
Duchy of Neopatria was created in 1204.
Duchy of Zator was created in 1454.
Duchy of Silesia was created in 1163.
Duchy of Westphalia was created in 1180.
Duchy of Głubczyce was created in 1172.
Duchy of Bielsko was created in 1572.
Duchy of Limburg was created in 1065.
Duchy of Salzburg was created in 1849.