District duchy in the context of "Duchy of Poland (1138–1227)"

Seniorate Province, also known as the Senioral Province, was a district principality in the Duchy of Poland that was formed in 1138, following the fragmentation of the state. Its ruler held the title of the High Duke, ruling all duchies within Poland. In 1227, following the abolition of the High Duke title, the province was transformed into the Duchy of Kraków.

The Duchy of Masovia was a district principality and a fiefdom of the Kingdom of Poland, existing during the Middle Ages. The state was centered in Mazovia in the northeastern Kingdom of Poland, and during its existence, its capital was located in the Płock, Czersk and Warsaw. It was formed in 1138 from the territories of the Kingdom of Poland, following its fragmentation, that was started by the testament of Bolesław III Wrymouth. The country existed in the years: 1138–1275, 1294–1310, 1370–1381, and 1495–1526, between that time, going through fragmentations of its territory into smaller duchies and its unification. The states formed during its fragmentation were duchies of Kuyavia, Dobrzyń, Czersk, Płock, Warsaw, Rawa and Belz. In 1526, the country was incorporated into the Kingdom of Poland.

The Duchy of Wiślica was a district principality and a fiefdom within the Kingdom of Poland. It was formed in 1166 from the territories of the Duchy of Sandomierz, following its fragmentation onto three parts. The state was ruled by Casimir II the Just, and it existed until 1173, when Casimir had assumed the throne of the Duchy of Sandomierz, uniting two states together. Its capital was Wiślica and it was located in the southern Sandomierz Land in the southeastern corner of the Kingdom of Poland. The state was later shortly reestablished in 1230 by Grzymisława of Łuck who ruled it as a regent in the name of her son, Bolesław V the Chaste. In 1234, they had become rulers of the whole Duchy of Sandomierz, with that year being the last mention of the duchy in the documents.

The Duchy of Kalisz was a feudal district duchy in Greater Poland, with its territorial and administrative core in the Kalisz Land — the region surrounding the city of Kalisz. Its capital was Kalisz. The duchy was established in 1177, following the partition of the Duchy of Greater Poland after a rebellion against Mieszko III. Duke Casimir II the Just of the Piast dynasty became its first ruler.

Initially, Kalisz remained a fiefdom within the broader Duchy of Poland — a term commonly applied to the fragmented realm, which some sources continue to refer to as the Kingdom of Poland — until 1227, when Kalisz gained independence as a duchy. It existed in this form until 1279, when it was united with the duchies of Gniezno and Poznań under the rule of Przemysł II, forming a reconstituted Duchy of Greater Poland.

The Duchy of Kuyavia was a district principality in Central Europe, created in the course of the 13th century in the region of modern-day Kuyavia after the inheritance of the Kingdom of Poland in 1138 into partial duchies through the will and testament of Duke Bolesław III Wrymouth.
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The Duchy of Czersk was a feudal district duchy in Masovia, centered on the Czersk Land. Its capital was Czersk.

The country was established in 1275, in the partition of the Duchy of Masovia, with duke Konrad II becoming its ruler. After his death, the duchy was unified with the Duchy of Płock, forming the Duchy of Masovia, on 24 June 1294. The state was again reestablished in 1310, with Trojden I, as its first ruler. It existed until 5 November 1370, when, under the rule of duke Siemowit III, duchies of Czersk, Rawa, and Warsaw were unified into the Duchy of Masovia. It was once again reestablished in 1471, from the part of the territories of the duchies of Płock and Warsaw. In 1488, it incorporated the Duchy of Warsaw, into its territory. It existed until 1495, when, with the incorporation of the Duchy of Płock into the Kingdom of Poland, it remained the only state in Masovia, and subsequently, got reformed into the Duchy of Masovia.

The Duchy of Płock was a feudal district duchy in Masovia, centered on the Płock Land. Its capital was Płock. It existed in the High Middle Ages era, from 1275 to 1294, from 1310 to 1351, and from 1381 to 1462.