This Day in Ancient History: ante diem xiii kalendas quinctilias

Icon depicting the First Council of Nicaea.
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ante diem xiii kalendas quinctilias

  • 240 B.C. — Eratosthenes calculates the circumference of the earth (I have no idea what the source for this is)
  • rites at the Temple of Minerva on the Aventine
  • ca. 165 (?) — martyrdom of Protase
  • 325 A.D. — Hosius announces the Nicene Creed during the First Council of Nicaea