Important Historical Events of the year 240, Year 240 in History

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List of 240 Major News Events in History, Most Important Historical Events in 240

What happened in the year 240?

Date	Event
April 12, 240	Shapur I becomes co-emperor of the Sasanian Empire with his father Ardashir I.
May 25, 240	First recorded perihelion passage of Halley's Comet.