The Tricolour Flag of Italy.

Is simple to explain.

The red and white is from the Genoese and the green and is from the Lombardi.

The two maritime states.
That where in business for around a thousand years.
They fought at times, white represents peace between the two.

The Genoese flag, is the cross of St George, that the Genoese rented to the British, to scare off pirates.
Italians also chased down pirates for the British, and taught them to Navy, and probably financed them, and the Venetians where the first to have an assembly line for building ships, hundreds of years before Henry Ford did it for cars.

Ok Italians are crazy and beautiful and genius.

Ciao.