An elderly Greek Orthodox priest heckled Pope Francis as he arrived for a visit with Archbishop Ieronymos II in Athens, Greece.
The priest shouted, "Pope, you are a heretic!", three times as security quickly apprehended him and took him away Saturday. The pope had already entered the archbishop's residence and did not appear to have heard.
There were also small protests against the pope on the island of Cyprus, where he stopped earlier in the trip.
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Despite the animosity outside, the two church leaders were friendly and pledged to work together to help issues such as climate change and immigration.
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The incident highlights the distrust between some members of the Eastern Orthodox and Catholic churches that remains nearly a thousand years after the two groups split in 1054. During the visit, Pope Francis reiterated Pope John Paul II's apology to the Orthodox world for any sins his church had committed against them.
The pope is visiting Greece on a three-day state visit.