Nothing is known of him for certain other than the story recorded by Suetonius. This story may mask another reason for Lucullus' execution; that so little is known has led to a number of theories about him.
Ronald Syme, noting the difficulty of polyonymous names, proposed identifying Lucullus with a known suffect consul of 89, Publius Sallustius Blaesus.[4] Blaesus is known from the correspondence of Pliny the Younger and a number of inscriptions, most notably the Acta Arvalia, which record his presence at their ceremonies during the years 77 through 91, when there is a gap in the Acta, and when it resumes in 101, Blaesus is missing. For this and related reasons Syme identified the two as the same person. His arguments were accepted by later experts, such as Anthony Birley[5] and Edward Champlin.[6] However, P. Conole and Brian Jones point out since the records of the Arval Brethren "record his presence in Rome during every year of the first half of Domitian's reign for which complete minutes have survived, it is difficult to see how he could have managed to gain sufficient provincial experience in praetorian posts to merit appointment to Britain, an Imperial consular province."[7]
A second theory was proposed by Dr. Miles Russell of Bournemouth University. An inscription from Chichester, recorded by Samuel Woodford in his Inscriptionum Romano-Britannicarum Conllectio (1658) but since lost, refers to Sallustius Lucullus, giving his praenomen as Gaius and describing him as a propraetorian legate of the emperor Domitian. Another inscription from Chichester, discovered in 1923, refers to a "Lucullus, son of Amminus". Russell argues that this is the same Lucullus, and that his father was the native British prince Amminus, son of Cunobelinus, who fled to Rome c. 40. He also argues that Fishbourne Roman Palace, near Chichester, was built for Sallustius Lucullus as governor, rather than, as is often argued, for the client king Tiberius Claudius Cogidubnus. Although other archaeologists have dated the construction of the palace to c. 73, Russell's reinterpretation of the ground plan and finds leads him to date the palace after 92, which would be consistent with Lucullus rather than Cogidubnus as its occupant.[8] However, other scholars argue against Russell's identification of the Lucullus of either inscription with the Roman governor. Woodford's missing inscription was dismissed as a fake by R. G. Collingwood and R. P. Wright in their Roman Inscriptions of Britain (1965): its mention of Domitian, whose name was removed from public inscriptions following his damnatio memoriae, argues for its inauthenticity, moreover the governors of Britain were ex-consuls, not ex-praetors. Russell's restoration of the second inscription (CIL VII, 10) produces a text which does not follow Roman naming conventions, and the altar the inscription is part of is not worthy of either a Celtic prince or a Roman governor, and omits any mention of the dedicant's rank.[9]
A third theory was proposed by Conole and Jones, identifying this Lucullus with the Lucius Lucullus who was proconsul of Hispania Baetica, and a student of marine life, at the time Pliny the Elder wrote his Natural History (c. 77).[10] This Lucullus would have been of appropriate rank to be appointed governor of Britain at the right date. Moreover, since it appears that although they are not the same person, Sallustius Blaesus is a relative of Lucullus, and Blaesus was appointed suffect consul the same year of Saturninus' unsuccessful revolt, Lucullus' execution had nothing to do with Saturninus' actions.[11] Brian Jones develops this scenario further in his study of Domitian. There Jones states that Gaius Julius Karus was awarded dona militaria comprising three crowns and a silver spearshaft for an otherwise unknown British war -- an exceptional decoration, and equivalent to the decorations Domitian awarded the man who crushed Saturninus' revolt. Jones proposes the following theory: Lucullus opposed Domitian's plans to move the frontier of Roman Britain south to a more defensible location; these views and associated acts were reported by Karus; the emperor Domitian saw this opposition as treason, and gave Karus orders to eliminate Lucullus, who was rewarded generously.[12] Nevertheless, Jones re-iterates that this reconstruction of events surrounding Lucullus "should be regarded as speculative."[13]