Claim: Władysław Oporowski(1395-11 March 1453) served in the Archdiocese of Gniezno from 1449 to 1453.
Evidence: 11 March 1453
Oporów 1395 Gniezno 1449 1453 
Deputy Chancellor of Poland (1429–1434), Bishop of Kujawy (1434–1449), archbishop of Gniezno and primate of Poland (1449–1453). Władysław Oporowski (1395–1453) was a Polish medieval political and religious leader. 11 March 1453
Oporów