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1240 was a leap year starting on Sunday of the Julian calendar. It was the first year of the 1240s decade, and was the same leap year starting on Sunday as the one in the Gregorian calendar, which was not in use at the time.

Millennium: 2nd millennium
Centuries: 12th century13th century14th century
Decades: 1210s  1220s  1230s  – 1240s –  1250s  1260s  1270s
Years: 1237 1238 123912401241 1242 1243

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