How many years passed between the treaty signed in 1230 and Pope Innocent IV allotting 2/3 of conquered Courland to the Livonian Order?
return the  treaty was  signed in  1230 ;return Pope Innocent IV allotting 2/3 of conquered Courland to the  Livonian Order ;return year of #1 ;return year of #2 ;return the  difference of #4 and  #3
['select', 'select', 'project', 'project', 'arithmetic']