Michelangelo
Michelangelo returned to Florence in 1499. The republic was changing after the fall of its leader, anti-Renaissance priest Girolamo Savonarola, who was executed in 1498, and the rise of the "gonfaloniere" Piero Soderini. Michelangelo was asked by the consuls of the Guild of Wool to complete an unfinished project begun 40 years earlier by Agostino di Duccio: a colossal statue of Carrara marble portraying David as a symbol of Florentine freedom to be placed on the gable of Florence Cathedral. Michelangelo responded by completing his most famous work, the statue of David, in 1504. The masterwork definitively established his prominence as a sculptor of extraordinary technical skill and strength of symbolic imagination. A team of consultants, including Botticelli and Leonardo da Vinci, was called together to decide upon its placement, ultimately the Piazza della Signoria, in front of the Palazzo Vecchio. It now stands in the Academia while a replica occupies its place in the square.
David with the Head of Goliath (Caravaggio, Vienna)
The model for David in both versions appears to be a more mature version of the pubescent Cupid of "Amor Vincit Omnia" and the Capitoline and Pamphilij "John the Baptist", all painted around 1602. The model for these works has been identified by some, most notably Peter Robb, as Cecco, a boy known to have been Caravaggio's servant in Rome in the early 17th century and believed by Robb to be identical with Cecco del Caravaggio, an artist active in Rome in the period 1610–1625 and painting very much in Caravaggio's manner. There is no record of Cecco having been with Caravaggio after the artist's flight from Rome in 1606.