Saturnalia
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https://en.wikipedia.org/wiki/Saturnalia
Saturnalia was the feast at which the the Romans commemorated the dedication of the temple of the god Saturn, which took place on 17 December. Over the years, it expanded to a whole week, up to 23 December. In the vagaring Roman calendar the Winter Solstice fell in this period; in imperial times that event was celebrated in honour of Sol Invictus and put on 25 December by emperor Aurelian in 274, so after the Saturnalia.
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