The Decameron is a collection of novellas by Giovanni Boccaccio, written in the 14th century. While not directly from the fin-de-siècle period, it is considered a precursor to the Decadent movement. The book consists of 100 tales told by a group of young people who have fled Florence during the Black Death. These stories explore themes of love, lust, and human folly, reflecting the decadence and moral ambiguity that would later characterize the fin-de-siècle era.