Peter Astbury Brunt FBA (23 June 1917 – 5 November 2005) was a British academic and ancient historian. He was Camden Professor of Ancient History at the University of Oxford from 1970 to 1982. During his career, he lectured at the University of St Andrews, Oriel College, Oxford, Gonville and Caius College, Cambridge, and Brasenose College, Oxford.
The Bellum Octavianum (Latin for "War of Octavius") was a Roman republican civil war fought in 87 BC between the two consuls of that year, Gnaeus Octavius and Lucius Cornelius Cinna. Cinna was victorious by late 87 BC.
Hostilities broke out after Octavius opposed Cinna's attempts to distribute the Italian citizens enfranchised after the Social War into all voting tribes and to recall the outlawed Gaius Marius from exile. Cinna was ejected from the city after a fight in the Forum. He began touring Italy to recruit men, while the Senate in Rome replaced him with Lucius Cornelius Merula, a priest of Jupiter, in the consulship. Cinna took control of the Roman army stationed at Nola and was joined by the exiled Marius. Octavius won the support of the two other Roman generals in the field in Italy, Metellus Pius and Pompeius Strabo; the Samnites, who were formally at war with Rome, joined Cinna. Peter Brunt estimates that Octavius had some 60,000 men at his disposal while Cinna had around twice that.