Saturnalia on 17 December was the Roman’s midwinter party festival. It had a definite topsy-turvy element, with masters waiting on their slaves, as shown in the illustration, and a generally indulgent attitude towards high jinks.
Today’s poem was written for a different occasion: it is an extract from one of Virgil’s pastoral poems, or Eclogues, written in 40 BCE and looking forward to a birth which will herald the start of a new golden age. It is appropriate to the run-up to Christmas because, though few if any would agree today, a strong current of opinion among early Christians and in the middle ages interpreted it as a prophesy of the birth of Christ. Hear the Latin and follow in English here.