"What was the most important event in the history of the world?"

"The Annunciation," St. Peter’s in Hamburg, by  Master Bertram of Minden, 1383 AD

Supreme Court Justice Antonin Scalia was asked that question in 1957 during his final oral exam before a panel of four history professors at Georgetown University.   Scalia gave one answer after another (Waterloo, Thermopylae)  but the chairman of the department, Dr. Walter Wilkinson, kept shaking his head.  Finally, Dr. Wilkinson replied, "Mr. Scalia, it was the Incarnation, when Christ became a man.  That is the correct answer."

It's still the correct answer.

h/t Creative Minority Report

On gay marriage, Scalia is entitled to say "I told you so"

For what that's worth.

Marriage is in tatters.  The citadel had been betrayed by its defenders long before it fell.