Wikipedia
Marzocco
The Marzocco is the heraldic lion that is a symbol of Florence, and was apparently the first piece of public secular sculpture commissioned by the Republic of Florence, in the late 14th century. It stood at the heart of the city in the Piazza della Signoria at the end of the platform attached to the Palazzo Vecchio called the ringhiera, from which speakers traditionally harangued the crowd. This is now lost, having weathered with time to an unrecognizable mass of stone.
The best known rendition is by Donatello, made in 1418–20. Donatello’s Marzocco was placed in the Piazza della Signoria in 1812, but in 1885 it was moved to the Bargello, having been replaced by the copy we see to this day.