William II, called the Good, was king of Sicily from 1166 to 1189. From surviving sources William's character is indistinct. Lacking in military enterprise, secluded and pleasure-loving, he seldom emerged from his palace life at Palermo. Yet his reign is marked by an ambitious foreign policy and a vigorous diplomacy. Champion of the papacy and in secret league with the Lombard cities, he was able to defy the common enemy, Frederick Barbarossa. In the Divine Comedy, Dante places William II in Paradise. He is also referred to in Boccaccio's Decameron.

The Decameron, subtitled Prince Galehaut and sometimes nicknamed l'Umana commedia, is a collection of short stories by the 14th-century Italian author Giovanni Boccaccio (1313–1375). The book is structured as a frame story containing 100 tales told by a group of seven young women and three young men; they shelter in a secluded villa just outside Florence in order to escape the Black Death, which was afflicting the city. Boccaccio probably conceived of the Decameron after the epidemic of 1348, and completed it by 1353. The various tales of love in The Decameron range from the erotic to the tragic. Tales of wit, practical jokes, and life lessons contribute to the mosaic. In addition to its literary value and widespread influence, it provides a document of life at the time. Written in the vernacular of the Florentine language, it is considered a masterpiece of early Italian prose.