It's a moment that historians absolutely drew all over.

In the early 1500s, Leonardo da Vinci was chatting with friends in a piazza in Florence.

They were discussing Dante's divine comedy.

Someone Ashley inardo his opinion about one passage, and Leonardo began stroking his long red beard.

He was stumped.

Then, none other than Michelangelo entered the piazza.

Headed down, striding fast.

As usual, Michelangelo was wearing filthy clothes and muttering to himself.

But Leonardo nudged his friend and said, let's ask Michelangelo.

He can explain the Dante passage.

Imagine that.

Two titans of the Renaissance about to trade opinions on the divine comedy.

What an amazing historical moment.

Except, things did not turn out that way.

Michelangelo, around age 30, turned and scowled at the 50-something Leonardo.

Michelangelo assumed Leonardo was mocking him.

Explain it yourself, he spat.

Then he started mocking Leonardo in return.

You, who designed a giant horse to cast in bronze and failed,

and then abandoned it out of shame.

Leonardo flushed red and turned away in sheer embarrassment.

Michelangelo then stomped off.

...