▁originally ▁written ▁the ▁opera ' s ▁Italian - language ▁libre tto ▁for ▁the ▁composer ▁Giuseppe ▁Bon no ▁in ▁ 1 7 4 4 . ▁He ▁re vised ▁the ▁text ▁for ▁Gl uck , ▁including ▁two ▁new ▁a rias . ▁The ▁opera ▁may ▁have ▁been ▁repr ised ▁on ▁ 3 0 ▁May ▁ 1 7 5 5 ▁at ▁La x enburg . ▁There ▁is ▁no ▁record ▁of ▁any ▁further ▁performance ▁until ▁ 1 9 8 7 , ▁when ▁it ▁appeared ▁at ▁the ▁Teatro ▁Comun ale ▁di ▁Bolog na . ▁ ▁R oles ▁ ▁Syn opsis ▁As ▁the ▁sun ▁sets , ▁the ▁she ph erd ▁Tir si ▁says ▁fare well ▁to ▁his ▁bel oved ▁Nice , ▁who ▁is ▁leaving ▁to ▁take ▁part ▁in ▁a ▁dance . ▁Tir si ▁reve als ▁he ▁is ▁je alous ▁of ▁Nice ' s ▁other ▁adm ir ers . ▁The ▁lo vers ▁argue ▁but ▁in ▁the ▁end ▁they ▁swe ar ▁to ▁be ▁true ▁to ▁one ▁another . ▁ ▁Musical ▁numbers ▁A part ▁from ▁the ▁opening ▁sin f onia , ▁the ▁score ▁contains ▁five ▁musical ▁numbers : ▁ ▁A ria : ▁" V a : ▁della ▁dan za ▁è ▁l ' ora " ▁ ▁A ria : ▁" Se ▁tu ▁non ▁ved i " ▁ ▁A ria : ▁" Che ▁c ias c un ▁per ▁te ▁s os pi ri " ▁ ▁A ria : ▁" Che ▁ch ied i ? ▁che ▁br ami ?" ▁ ▁Du et : ▁" M ille ▁volte , ▁m io ▁t es oro " ▁ ▁Rec