▁and ▁libre tt ist ▁together ▁had ▁any ▁opportunity ▁to ▁rev ise ▁and ▁rest ruct ure ▁it ▁more ▁accept ably . ▁However , ▁in ▁her ▁research ▁for ▁the ▁critical ▁edition , ▁Hans ell ▁notes ▁that ▁in ▁ 1 8 5 6 ▁Ver di ▁an gr ily ▁with d rew ▁his ▁opera ▁from ▁circul ation , ▁re using ▁parts ▁of ▁the ▁score ▁for ▁his ▁re work ed ▁ 1 8 5 7 ▁version , ▁the ▁libre tto ▁also ▁ ▁prepared ▁by ▁Pia ve : ▁it ▁was ▁renamed ▁as ▁A ro ld o ▁and ▁set ▁in ▁ 1 3 th ▁century ▁Ang lo - S ax on ▁England ▁and ▁Scotland . ▁It ▁ ▁contains ▁a ▁totally ▁new ▁fourth ▁act . ▁ ▁Through out ▁the ▁rest ▁of ▁the ▁ 1 9 th ▁century ▁and ▁for ▁most ▁of ▁the ▁ 2 0 th , ▁the ▁St iff el io ▁aut ograph ▁was ▁generally ▁pres umed ▁to ▁be ▁lost . ▁▁ 2 0 th ▁century ▁performances ▁before ▁October ▁ 1 9 9 3 ▁ ▁Hans ell ▁is ▁clear ▁on ▁several ▁points ▁regarding ▁any ▁performances ▁between ▁ 1 8 5 6 ▁and ▁October ▁ 1 9 9 3 : ▁All ▁previous ▁modern ▁ed itions , ▁including ▁the ▁score ▁prepared ▁by ▁Edward ▁Down es ▁and ▁first ▁performed ▁in ▁January ▁ 1 9 9 3 ▁by ▁The ▁Royal ▁Opera ▁company ▁at ▁Cov ent ▁Garden , ▁were ▁based ▁largely ▁or ▁entirely ▁on ▁secondary ▁sources , ▁such ▁as ▁the ▁early ▁printed ▁vocal ▁score ▁and ▁defect ive ▁ 1 9 th - century ▁manuscript ▁copies