TDIAH
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ante diem xix kalendas januarias 250 A.D. — martyrdom of Heron 283 A.D. — martyrdom of Justus and Abundius
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idus decembres Rites in honour of Tellus, the earth goddess which perhaps included a lectisternium (a ‘dinner party’ at which images of the god(s) would ‘dine’ with participants) in honour of Ceres. 405 B.C. — battle of Aegospotami (by one reckoning) 304 A.D. — martyrdom of Lucy of Syracuse 1783 — Death of Samuel Johnson
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ante diem iii idus decembres Agonalia — the fourth and final occurrence of this festival in the Roman calendar; like all instances, the Rex Sacrorum would sacrifice a ram in the Regia, but on this occasion, the sacrifice was apparently in honour of Sol Indiges. Septimontium — a somewhat obscure festival apparently originally only celebrated…
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ante diem iv idus decembres The tribunes of the plebs would enter their office on this day during the Roman Republic. ca 300 A.D. — martyrdom of Carpophorus
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ante diem vi idus decembres Rites in honour of Tiberinus and Gaia — not a lot is known about these rites; Tiberinus had a temple on the Tiber island and presided over the Tiber (of course); Gaia seems to have originally given the Campus Martius (a.k.a. Campus Tiberinus) to the Roman people. 65 B.C.…