Text: Prince Mieszko, leader of the Piast dynasty that ruled the Polonians, undertook the bold step to unify the Polanie (literally, people of the fields ) and neighboring tribes.
Entailment: Leader of the Piast dynasty that ruled the Polonians, Prince Mieszko undertook the bold step to unify the Polanie (literally, people of the fields) and neighboring tribes.
Contradiction: Prince Mieszko took the bold step to declare war on all the neighboring tribes.