1 Quattrino -

Florence's quattrino coinage of the 1370s circulated during a period of acute municipal stress — the city was moving toward the Ciompi revolt of 1378, when wool-carders and disenfranchised laborers briefly seized control of the government in one of the earliest documented workers' uprisings in European history. Billon's debased silver content was itself a political calculation, stretching the commune's metal reserves during years of factional expenditure and mercenary contracts.

MIR FI#88 places this among the issues attributed to the third quarter of the fourteenth century under the priorate system, where monetary decisions passed through rotating magistrates rather than a single authority.