It was begun by the architect Antonio da San Gallo the younger in 1527 for Clement VII., who fled to Orvieto after the sack of Rome, and was finished by Simone Mosca under Paul III.
In the Sala dei Nove or della Pace above are the noble allegorical frescoes of Ambrogio Lorenzetti representing the effects of just and unjust government; the Sala delle Balestre or del Mappamondo is painted by Simone di Martino (Memmi) and others, the Cappella della Signoria by Taddeo di Bartolo, and the Sala del Consistorio by Beccafumi.
The 14th century gives us Ugolino, Duccio di Buoninsegna, Simone di Martino (or Memmi), Lippo Memmi, Pietro and Ambrogio Lorenzetti, Andrea di Vanni (painter and statesman), Bartolo di Fredi and Taddeo di Bartolo.
From these contests of rival nobles, in which the names of Spinola and Doria stand forth with greatest prominence, Genoa was soon drawn into the great vortex of the Guelph and Ghibelline factions; but its recognition of foreign authority - successively German, Neapolitan and Milanese - gave way to a state of greater independence in 1339, when the government assumed a more permanent form with the appointment of the first doge, an office held at Genoa for life, in the person of Simone Boccanera.
CAMILLO PORZIO (1526-1580?), Italian historian, belonged to a wealthy and noble Neapolitan family, and was the son of the philosopher, Simone Porzio.