The district duchy, also known as a district principality, was a type of state under the patrimonial system, such as a duchy or principality, formed in the feudal system as a result of a land partition between the members of a royal family (Feudal fragmentation). It occurred in the Middle Ages and early modern period, notably in Europe, in states such as the Holy Roman Empire,Kyra T. Inachin, Die Geschichte Pommerns, Hinstorff Rostock, 2008, p. 30, ISBN 978-3-356-01044-2. Duchy of Poland,Jerzy Wyrozumski: Historia Polski do roku 1505, pp. 104–111 and Kievan Rus'.Tadeusz Manteuffel: Historia powszechna. Średniowiecze. Warsaw: Wydawnictwo Naukowe PWN, 1990, p. 250. ISBN 83-01-08685-8.
Holy Roman Empire Bavaria
Bavaria-Ingolstadt Bavaria-Landshut Bavaria-Munich Bavaria-Straubing
Mecklenburg
Mecklenburg-Güstrow Mecklenburg-Schwerin Mecklenburg-Stargard Mecklenburg-Strelitz
Palatinate
Palatinate-Birkenfeld Palatinate-Birkenfeld-Bischweiler Palatinate-Birkenfeld-Gelnhausen Palatinate-Birkenfeld-Zweibrücken Palatinate-Kleeburg Palatinate-Landsberg Palatinate-Lautern Palatinate-Mosbach Palatinate-Mosbach-Neumarkt Palatinate-Neuburg Palatinate-Neumarkt Palatinate-Simmern Palatinate-Simmern and Zweibrücken Palatinate-Simmern-Kaiserslautern Palatinate-Simmern-Sponheim Palatinate-Sulzbach Palatinate-Sulzbach-Hilpoltstein Palatinate-Zweibrücken Palatinate-Zweibrücken-Birkenfeld Palatinate-Zweibrücken-Vohenstrauss-Parkstein
Pomerania
Pomerania-Demmin Pomerania-Stettin Pomerania-Schlawe Pomerania-Wolgast Pomerania-Stolp Pomerania-Neustettin Pomerania-Stargard Pomerania-Barth Pomerania-Rügenwalde Pomerania-Wolgast-Stolp
Saxony and Thuringia
Saxe-Altenburg Saxe-Coburg Saxe-Coburg-Eisenach Saxe-Coburg-Saalfeld Saxe-Eisenberg Saxe-Coburg-Gotha Saxe-Eisenach Saxe-Gotha Saxe-Gotha-Altenburg Saxe-Hildburghausen Saxe-Jena Saxe-Marksuhl Saxe-Meiningen Saxe-Römhild Saxe-Saalfeld Saxe-Weimar Saxe-Weimar-Eisenach
Poland Original division
Seniorate Province (later reformed into the Duchy of Kraków) Duchy of Greater Poland Duchy of Sandomierz Duchy of Masovia Duchy of Silesia
Greater Poland
Duchy of Poznań Duchy of Gniezno Duchy of Kalisz
Sandomierz
Duchy of Wiślica
Masovia
Duchy of Czersk Duchy of Płock Duchy of Warsaw Duchy of Rawa Duchy of Belz Duchy of Wizna
Kuyavia
Duchy of Łęczyca Duchy of Sieradz Duchy of Brześć Kujawski Duchy of Inowrocław Duchy of Bydgoszcz and Wyszogród Duchy of Gniewkowo Duchy of Dobrzyń
Silesia
Pomerelia
Duchy of Gdańsk Duchy of Świecie and Lubiszewo Duchy of Białogarda Duchy of Lubiszewo Duchy of Świecie
References