Casimir I (or Kasimir I) (after 1130 – 1180) was

duke of Pomerania This is a list of the duchies and dukes of Pomerania. Dukes of the Slavic Pomeranian tribes (All Pomerania) The lands of Pomerania were firstly ruled by local tribes, who settled in Pomerania around the 10th and 11th centuries. Non-dynastic ...

since his uncle Ratibor I's death in 1155/56. A son of Wartislaw I, he co-ruled Pomerania with his older brother Bogislaw I, receiving Pomerania-Demmin as his share just as Bogislaw received Pomerania-Stettin, and ruling the remainder in common. After the lost 1164 Battle of Verchen, where Casimir and Bogislaw aided an Obodrite rebellion against the duke of

Saxony Saxony, officially the Free State of Saxony, is a landlocked state of Germany, bordering the states of Brandenburg, Saxony-Anhalt, Thuringia, and Bavaria, as well as the countries of Poland and the Czech Republic. Its capital is Dresden, and ...

, Henry the Lion, Casimir and Bogislaw joined Saxony receiving their respective part duchies as a fief from Henry the Lion. Casimir also received one third of the Danish ''terra''

Wolgast Wolgast () is a town in the district of Vorpommern-Greifswald, in Mecklenburg-Vorpommern, Germany. It is situated on the bank of the river (or strait) Peenestrom, vis-a-vis the island of Usedom on the Baltic Sea, Baltic coast that can be accessed ...

. When Saxony allied with the Danes to subdue the

Rani ''Rani'' () is a female title, equivalent to queen, for royal or princely rulers in the Indian subcontinent and Southeast Asia. It translates to 'queen' in English. It is also a Sanskrit Hindu feminine given name. The term applies equally to a ...

kingdom of

Rügen Rügen (; Rani: ''Rȯjana'', ''Rāna''; , ) is Germany's largest island. It is located off the Pomeranian coast in the Baltic Sea and belongs to the state of Mecklenburg-Western Pomerania. The "gateway" to Rügen island is the Hanseatic ci ...

in 1168, Casimir as well as Bogislaw aided Henry. Casimir also managed to take control in

Circipania Circipania () was a medieval territory in what is now northeastern Germany. The name derives from Latin ''circum'' (around) and ''Pane'' (the Peene River). The region was enclosed roughly by the upper Recknitz, Trebel and Peene rivers, the west ...

, thereby expanding Pomerania to the West. Casimir participated in other campaigns launched by Henry the Lion, as an 1178/79/80 expedition into

Lusatia Lusatia (; ; ; ; ; ), otherwise known as Sorbia, is a region in Central Europe, formerly entirely in Germany and today territorially split between Germany and modern-day Poland. Lusatia stretches from the Bóbr and Kwisa rivers in the eas ...

and

Jüterbog Jüterbog () is a historic town in north-eastern Germany, in the Teltow-Fläming district of Brandenburg. It is on the Nuthe river at the northern slope of the Fläming hill range, about southwest of Berlin. History The Polabian Slavs, Slavic se ...

. However, Casimir suffered heavy losses at the battle at Julin Bridge and later died in 1180 in a battle with Brandenburg margrave

Otto I Otto I (23 November 912 – 7 May 973), known as Otto the Great ( ) or Otto of Saxony ( ), was East Francia, East Frankish (Kingdom of Germany, German) king from 936 and Holy Roman Emperor from 962 until his death in 973. He was the eldest son o ...

, having no children yet with his wife Pritolawa. Pomerania-Demmin was then governed by his brother Bogislaw and later by Bogislaw's second son Casimir II, his first son Bogislaw II receiving Pomerania-Stettin, so Pomerania would further be governed in a manner resembling the reign of Casimir I and Bogislaw I. Casimir founded monasteries in Broda (1170) and Belbuck (1177). He participated in founding the monastery

Dargun Dargun is a town in the Mecklenburgische Seenplatte district, in Mecklenburg-Western Pomerania, Germany. It is situated km west of Demmin. It is famous for Dargun Palace, a former Cistercian abbey. History From 1815 to 1918 Dargun was part o ...

(1172/74) and in 1176/80 granted privileges to the bishopric of Wollin that moved its seat to Cammin (now

Kamień Pomorski Kamień Pomorski (; ; or ''Kammin'') is a spa town in the West Pomeranian Voivodeship of north-western Poland, on the Baltic coast. It is the seat of an urban-rural gmina (administrative district) in Kamień County which lies approximately 63&n ...

) because of Danish expeditions.

See also