Why the Renaissance originated in Florence is one of the core issues in the history of Renaissance studies. From the perspective of political sociology

this paper argues that the rise of Florence was the result of the coupling of the institutional space of the republican regime

the transformation mechanism of commercial capital

and the integrative function of patronage networks. The republican regime provided a relatively open space for public debate and a legitimate framework for citizen participation

enabling humanists to transform classical resources into an ideology of urban identity. The prosperous industry

commerce and banking provided sustainable economic support for cultural production

and allowed wealth to be converted into prestige and cultural capital through the patronage system. The patronage network centered on the Medici family acted as a cultural broker

attracting

screening and integrating the most outstanding thinkers and artists of the time. This interpretive framework transcends single-factor determinism and understands the origin of the Renaissance as a product of the interaction between political structure

economic dynamics and social networks under specific historical conditions. The life and writings of the humanist Leonardo Bruni are a perfect manifestation of this mechanism at the individual level.