225 Bc

• Seleucus III Ceraunus succeeds his father Seleucus II Callinicus as king of the Seleucid dynasty.
• Battle of Faesulae, Romans are defeated by the Gauls of Northern Italy.
• Erastothenes of Cyrene calculates the circumference of the Earth and invents armillary sphere
• Apollonius of Perga writes On Conic Sections and names the ellipse, parabola, and hyperbola.
• State of Qin conquered the state of Wei in China.

• Fan Ju
• Seleucus II Callinicus, king of the Seleucid dynasty. (riding accident)

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