The Roman festival dedicated to Saturn was Saturnalia, held in December near the winter solstice.
Saturnalia began as a one-day festival on December 17, marking the dedication anniversary of Saturn’s temple in the Roman Forum. By the late Republic, celebrations had expanded, and the festival period could last up to seven days, commonly running through December 23.
The festival honored Saturn as an agricultural god associated with abundance and the mythical Golden Age. Romans celebrated with a public sacrifice and banquet, followed by feasting, gift-giving, gambling, and the cry “Io Saturnalia!” Social conventions were temporarily loosened: enslaved people and masters could exchange roles symbolically, and masters might serve meals to enslaved members of their households.
Saturnalia was close to, but not strictly identical with, the astronomical winter solstice. That timing helped connect the festival with returning sunlight and renewal. It is also often compared with later midwinter customs, although claims that it directly became Christmas are more complicated than the popular story suggests.