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The 1240s was a decade of the Julian Calendar which began on January 1, 1240, and ended on December 31, 1249.
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
{{cite book}}: CS1 maint: location missing publisher (link)1241 Pousa transylvania.
1241 Henry II Poland.