▁R oles ▁ ▁Pier ▁Francesco ▁Or s ini , ▁Duke ▁of ▁Bom ar zo ▁( ten or ) ▁ ▁Gi rol amo , ▁elder ▁brother ▁of ▁Pier ▁Francesco ▁( bar it one ) ▁ ▁Ma erb ale , ▁younger ▁brother ▁of ▁Pier ▁Francesco ▁( bar it one ) ▁ ▁Bom ar zo ' s ▁father ▁( b ass ) ▁ ▁Bom ar zo ' s ▁grand m other ▁( contr al to ) ▁ ▁P ant as ile a , ▁cour tes an ▁of ▁Florence ▁( mez zo - s op rano ) ▁ ▁Julia ▁F arn ese , ▁the ▁Duke ' s ▁wife ▁( s op rano ) ▁ ▁Sil v io ▁de ▁Nar ni , ▁al chem ist ▁to ▁the ▁Duke ▁( bar it one ) ▁ ▁Ab ul , ▁slave ▁to ▁Bom ar zo ▁( sil ent ▁role ) ▁ ▁Nicolas , ▁nep hew ▁to ▁Bom ar zo ▁( ten or ▁or ▁alto ) ▁ ▁A ▁mess enger ▁( bar it one ) ▁ ▁A ▁she ph erd ▁( boy ▁sop rano ) ▁ ▁Pier ▁Francesco , ▁Gi rol amo ▁and ▁Ma erb ale ▁as ▁children ▁( child ▁speak ers ) ▁ ▁A ▁ske leton ▁( dan cer ) ▁ ▁Syn opsis ▁Pier ▁Francesco ▁Or s ini , ▁the ▁Duke ▁of ▁Bom ar zo , ▁a ▁st unted ▁h unch back , ▁drink s ▁what ▁his ▁ast ro lo ger ▁Sil v io ▁de ▁Nar ni ▁claims ▁to ▁be ▁a ▁magic ▁pot ion ▁that ▁will ▁grant ▁the ▁Duke ▁imm ort