How did Florence, Milan, Venice, Naples, Sicily, and the Papal States differ as Italian powers?

During the Renaissance, Italy was characterized by intense political fragmentation, with power concentrated in five major states: Florence, Milan, Venice, the Papal States, and the Kingdom of Naples (often united with Sicily). These powers differed significantly in their governance, economic foundations, and political objectives.1

• Florence: A republic that evolved into an oligarchy, Florence was a major center for banking and the wool industry. Its politics were marked by frequent office rotation to prevent tyranny, though influential families like the Medici eventually dominated through patronage.2
• Milan: Ruled by the Visconti and later the Sforza dynasties, Milan functioned as a signoria (lordship). It was a powerful, expansionist military state that often clashed with its neighbors.34
• Venice: A stable, long-lasting republic governed by a hereditary patrician class, Venice was defined by its maritime empire and sophisticated diplomatic service. Its government was highly structured, featuring the Great Council and the Council of Ten.5
• Papal States: Centered in Rome, the papacy exercised temporal power over central Italy. Its politics were often driven by the personal ambitions of popes, who engaged in complex maneuvers to maintain independence from foreign powers like Spain.6
• Naples and Sicily: These southern territories were often united under foreign dynasties, including the Angevins and the Aragonese. Unlike the northern city-states, these regions were characterized by a strong, entrenched feudal nobility and frequent dynastic disputes.7