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About Duchy of Kalisz
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.
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