qu iem ▁from ▁Wolfgang ▁Ama de us ▁Moz art ▁by ▁Count ▁Franz ▁von ▁W alse gg . ▁The ▁document ▁was ▁cens ored ▁in ▁Vienna ▁in ▁February ▁ 1 8 3 9 ; ▁the ▁back ▁of ▁the ▁book let ▁was ▁marked ▁" Not ▁allowed ▁Imperial ▁and ▁Royal ▁Office ▁C ensor . ▁Vienna , ▁ 8 ▁Feb . ▁ 1 8 3 9 . ▁Fre y berger ▁mp ria ." ▁An ▁edited ▁version ▁finally ▁appeared ▁in ▁a ▁Vienna ▁newspaper ▁in ▁ 1 9 2 5 . ▁ ▁Herzog ▁is ▁also ▁noted ▁for ▁his ▁historical ▁accounts ▁of ▁the ▁W alse gg ▁family . ▁This ▁included ▁his ▁works ▁on ▁the ▁death ▁of ▁W alse gg ' s ▁wife ▁in ▁February ▁ 1 7 9 1 . ▁This ▁incident ▁is ▁said ▁to ▁have ▁caused ▁the ▁controvers y ▁about ▁Moz art ' s ▁Re qu iem ▁after ▁the ▁count ▁alleg edly ▁commission ed ▁Moz art ▁to ▁compose ▁a ▁requ iem ▁to ▁comm emor ate ▁the ▁anni versary ▁of ▁her ▁death . ▁ ▁Re qu iem ▁controvers y ▁ ▁Herzog ▁offered ▁a ▁first - person ▁account ▁recognized ▁as ▁cru cial ▁in ▁the ▁pres ervation ▁of ▁the ▁history ▁of ▁Moz art ' s ▁Re qu iem . ▁He ▁stated ▁that ▁he ▁had ▁personal ▁invol vement ▁with ▁W alse gg , ▁including ▁two ▁performances ▁of ▁the ▁work , ▁which ▁the ▁count ▁directed ▁in ▁December ▁ 1 7 9 3 ▁and ▁February ▁ 1 7 9 4 . ▁In ▁the ▁Herzog ▁Report , ▁he ▁claimed ▁that ▁the ▁requ iem ▁existed ▁in ▁the ▁form