The Concordat of the Forty Articles (Portuguese: Concordata dos Quarenta Artigos) was an agreement reached in 1289 between the Kingdom of Portugal and the Holy See. Signed by King Denis and Pope Nicholas IV, it ended a conflict between the Portuguese monarchy and the Papacy that had begun in 1267 under Denis's father, Afonso III. The dispute had led to the excommunication of both kings.
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Text from the Wikipedia article “Concordat of the Forty Articles”, available under CC BY-SA 4.0.