The Kingdom of Saudi Arabia executed Shiite Muslim cleric Nimr al-Nimr on Saturday. Hours later, Iranian protestors set fire to the Saudi embassy in Tehran. On Sunday, the Saudi government, which considers itself the guardian of Sunni Islam, cut diplomatic ties with Iran, which is a Shiite Muslim theocracy.

To explain what’s going on, the New York Times provided a primer on the difference between Sunni and Shiite Islam, informing us that “a schism emerged after the death of the Prophet Muhammad in 632” — i.e., 1,383 years ago.

But to the degree that the current crisis has anything to do with religion, it’s much less about whether Abu Bakr or Ali was Muhammad’s rightful successor and much more about who’s going to control something more concrete right now: oil

—- Jon Schwarz, One Map That Explains the Dangerous Saudi-Iranian Conflict, The Intercept; see map here