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A funeral is being held Friday in Italy for Giulio Regeni, a doctoral student allegedly tortured and killed in Egypt. Thousands have demanded an independent probe into Regeni's death.
The 14th century Persian poet Hafez remains venerated in Iran, even though he wrote of wine, romance and other topics not necessarily welcome in today's Islamic Republic.
The tax would apply to all kinds of trading, but estimates of how much revenue it might raise vary greatly.
The split dates from when Christianity first spread through the Roman Empire. Friday's meeting between Pope Francis and Patriarch Kirill is the culmination of longstanding efforts to promote dialogue.