The spat between Saudi Arabia and Iran heated up earlier this month after the execution of Shia religious leader Nimr al-Nimr and the burning of the Saudi embassy in Tehran.
Some have called the feud a war within the Muslim world, pointing to what many see as an inevitable clash between the two countries. A look at history however, proves otherwise.
In this week's Reality Check, Mehdi Hasan challenges the notion that the current row between Saudi Arabia and Iran stems from a 1,400-year-old theological split and says the feud should not taint relations between Muslims, the majority of whom live outside the Middle East.
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