In classical Italian melodramma (opera), the famous Latin line "Sic eat quaecumque Romana lugebit hostem"(uttered by Horatius after slaying his sister for mourning Rome's enemy) is stripped of its literal Latin phrasing and transformed into highly charged, poetic Italian text. [1, 2, 3]

The scene is famously reproduced in two major Italian operas based on Pierre Corneille's tragedy Horace: Domenico Cimarosa’s Gli Orazi e i Curiazi (1796) (libretto by Antonio Simeone Sografi) and Saverio Mercadante’s Orazi e Curiazi (1846) (libretto by Salvadore Cammarano). [1, 2, 3, 4, 5]

1. The Verbal Reproduction (The Libretto Text)

Because Italian opera librettists had to adhere to strict poetic meters (like endecasillabi and settenari), they could not use the exact Latin phrase. Instead, they adapted the moral essence of the quote—that any Roman who weeps for an enemy must die:

• In Cimarosa/Sografi's version (1796):
  Orazio delivers a direct translation of the sentiment as he strikes Orazia down, singing:

  "Mora colei che versa lacrime sul nemico di Roma!" (or similarly rendered in recitative as "Mora chi ad un nemico..." / "Ah, sì, mora...").

  [1]
• In Mercadante/Cammarano's version (1846):
  The sister is renamed Camilla (following Corneille's play). When she curses Rome out of grief for her slain lover Curiazio, Orazio draws his sword and declares her a traitor to the fatherland. The sentiment is adapted into a dramatic exclamation:

  "Mora l'infame!" (Let the infamous woman die!) or "Mora colei che piange!".

  [1, 2, 3]

2. The Musical and Scenic Reproduction

In both operas, this moment serves as the high-stakes dramatic climax of the final act. Rather than just a quick historical execution, the scene is stretched into a structured operatic set-piece:

• The Provocation: The scene begins with a tense recitative. Orazio enters victorious, carrying the spoils of the Curiazi. Instead of celebrating, Orazia/Camilla notices her lover's armor or cloak and breaks into an agony of grief. [1, 2]
• The Confrontation: A fiery duet or trio ensues. The sister openly denounces Rome's cruelty, which Orazio perceives as a severe betrayal of civic duty and family honor. [1, 2, 3]
• The Climax: Musically, the orchestra builds to an aggressive, fortissimo crescendo. Orazio strikes his sister offstage or at the edge of the stage.
• The Aftermath: The line triggers the immediate transition into the opera's Gran Finale. The horror of a brother murdering his sister shifts the musical mood from triumphant military marches to dark, tragic ensembles, where the Roman populace and their father voice shock and debate Orazio's fate. [1, 2, 3]

If you are looking at specific performance histories or musical scores, would you like to explore Cimarosa's 18th-century classical setting or Mercadante's 19th-century Bel Canto version? [1, 2]