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In page Pope John Paul II:

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In his apostolic pilgrimage to Norway, Iceland, Finland, Denmark and Sweden of June 1989,[3] John Paul II became the first pope to visit countries with Lutheran majorities. In addition to celebrating Mass with Catholic believers, he participated in ecumenical services at places that had been Catholic shrines before the Reformation: Nidaros Cathedral in Norway; near St. Olav's Church at Thingvellir in Iceland; Turku Cathedral in Finland; Roskilde Cathedral in Denmark; and Uppsala Cathedral in Sweden.[citation needed]