Bellona (bɛlˈloːna) was an ancient Roman goddess of war. Her main attribute is the military helmet worn on her head; she often holds a sword, spear, or shield, and brandishes a torch or whip as she rides into battle in a four-horse chariot. She had many temples throughout the Roman Empire. She is known for her temple outside of Rome being the official decision making centre in regards to war and for her bloodlust and madness in battle. Her iconography was extended by painters and sculptors following the Renaissance.
The name of the goddess of war Bellōna stems from an earlier Duellona, itself a derivative of Old Latin duellum ('war, warfare'), which likewise turned into bellum in Classical Latin.
The etymology of duellum remains obscure. Linguist Georges-Jean Pinault has proposed a derivation from *duenelo- ('quite good, quite brave'), a reconstructed diminutive of the word duenos, attested on an eponymous inscription as an early Old Latin antecedent of the word bonus ('good'). According to linguist Michiel de Vaan, the use of *duenelo- "in the context of war (bella acta, bella gesta) could be understood as a euphemism, ultimately yielding a meaning 'action of valour, war' for the noun bellum."
Bellona was originally an ancient Sabine goddess of war identified with Nerio, the consort of the war god Mars, and later with the Greek war goddess Enyo. Her temple in Rome was dedicated in 296 BCE near the Circus Flaminius by Appius Claudius Caecus, during the war with the Etruscans and Samnites. This temple was the first location to have decorative shields dedicated to mortals hung in a holy place. Appius Claudius hung the shields and dedicated them to his family.
Her festival was celebrated on 3 June, and her priests were known as Bellonarii and used to wound their own arms or legs as a blood sacrifice to her. These rites took place on 24 March, called the day of blood (dies sanguinis), after the ceremony. In consequence of this practice, which approximated to the rites dedicated to Cybele in Asia Minor, both Enyo and Bellona became identified with her Cappadocian aspect, Ma.