ABSTRACT
By1245,thecrusadehadalreadyreachedahighlevelofsophisticationand formalisation,aftertheworkofpeoplelikeInnocentIIIandRaymonddePefiafort. InnocentIII'sinitiatives(thatis,theCrusadeagainstformerChristians)andthe lessonslearntduringtheFourthCrusade,ledtotheFourthLateranCouncilandits Adliberandamconstitutions(aswellastotheFifthCrusade),wherethebulkofthe crusadinglegalsystem,definitionandmechanismwereestablished. 1TheDecretals ofRaymonddePefiafort(1234),anotherlegalcompilation,wastheothergreat workwhichhelpedtoestablishthecrusadeasawell-definedmechanism.
