This cannon ball landed on the steps of the Great Hall of Palazzo Colonna in 1849. It was fired by the French army from the Janiculum Hil in an attempt to help Pope Pius IX with the Republican insurgents who occupied the center of Rome for a few months. It remains where it landed.

"Palazzo Colonna is one of the oldest and largest private palaces of Rome.
Its construction began in the fourteenth century by the Colonna family, who still resides there since eight centuries.
The Colonna family dates back to the twelfth century and comes from the town of Colonna, near Rome, from which it takes its name."

www.galleriacolonna.it/en/palazzo-colonna

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