The Duchy of Sandomierz was a district principality and a fiefdom of the Kingdom of Poland. 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 Duchy of Sandomierz was a district principality and a fiefdom of the Kingdom of Poland. 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.
Source: Wikipedia "Duchy of Sandomierz" · CC BY-SA 4.0
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