Mieszko III, sometimes called the Old, was Duke of Greater Poland from 1138 and High Duke of Poland, with interruptions, from 1173 until his death.
Mieszko's seal from 1145
Poland under the sons of Bolesław Wrymouth: Seniorate Province of Władysław II, composed of Eastern Greater Poland, Lesser Poland, Western Kuyavia, Wieluń Land Silesian Province of Władysław II Masovian Province of Bolesław IV composed of Masovia and Eastern Kuyavia Greater Poland Province of Mieszko III composed of Western Great Poland Sandomierz Province of Henry Łęczyca Province of Salomea (Łęczyca Land, Sieradz Land) Pomeranian vassals
Greater Poland under Mieszko III: Poznań, held by Odon 1177–82 Poznań, held by Odon 1177–1194, by Władysław III 1194–1202 Kalisz, conquered in 1181, held by Mieszko the Younger 1191–93, by Odon 1193–94 Gniezno, conquered in 1181 Kuyavia, held by Bolesław 1186–95
The Duchy of Greater Poland was a district principality in Greater Poland that was a fiefdom of the Kingdom of Poland. It was formed in 1138 from the territories of the Kingdom of Poland, following its fragmentation started by the testament of Bolesław III Wrymouth. In 1177, the state broke had separated into the duchies of Poznań, Gniezno and Kalisz, and united again in 1279, lasting in that form until 1320, when it was incorporated back into the Kingdom of Poland. Its capital was Poznań.
Fragmentation of Poland in 1138: Duchy of Greater Poland of Mieszko III composed of Western Great Poland
The rebuilt Royal Castle, Poznań in Poznań
