The 1240s was a decade of the Julian Calendar which began on January 1, 1240, and ended on December 31, 1249.
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Fibonacci. Fibonacci sequence and Liber Abbaci
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
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1241 Pousa transylvania.
1241 Henry II Poland.