This article needs additional citations for verification .(November 2014)
Titus Vinius (12 – 69) was a Roman general and one of the most powerful men in Rome during the reign of the Emperor Galba.
Plutarch has a number of stories of Vinius' early life, all to his discredit. He says that when, as a young man, he was serving in his first campaign, he brought his commander's wife into the camp by night disguised as a soldier, and had sex with her in the general's quarters. He was imprisoned for this by Caligula, but on that emperor's death was released.
Later on, again according to Plutarch and Tacitus, when he was invited to supper by the emperor Claudius he stole a gold drinking cup. Claudius was told of this, and invited him to supper again the following evening. When Vinius came, Claudius made his point by having his attendants set earthenware plates before him instead of silver. Nevertheless, Tacitus, who elsewhere describes him as "the most worthless of mankind", says that as proconsul of Gallia Narbonensis he administered the province with strict integrity.
Vinius was commander of one of the legions in Hispania when Galba was governor there. When Galba was proclaimed emperor in 68, Vinius accompanied him to Rome, where Galba chose him to be his colleague as consul. Vinius quickly came to have great influence—indeed, it was said that he and two others, Cornelius Laco, the commander of the Praetorian Guard, and Galba's freedman Icelus Martianus, virtually controlled the emperor. The three were called "the three pedagogues" because of their influence on Galba. Tacitus writes that Vinius' "unpopularity grew every day along with his power".  According to Suetonius and Plutarch, Vinius was exceedingly greedy for money, prepared to do anything in return for a bribe. In particular, he protected Tigellinus, who was blamed for having corrupted Nero, from retribution in exchange for a large bribe.
In early 69 Galba was faced with the need to designate an heir. Titus Vinius supported Otho, having already secretly agreed that Otho should marry his daughter Crispina.  Galba, however, for once refused to follow Vinius' advice and instead selected Piso Licinianus as his adopted son and designated heir. Otho responded by persuading the Praetorian guard to proclaim him emperor instead of Galba. With turmoil in the streets, Titus Vinius advised Galba to remain in the palace and to arm the slaves in the palace to help defend it. Laco and Icelus, however, advised Galba to go out and show himself. Galba followed their advice, and was killed by the Praetorians. Vinius tried to run away, calling out that Otho had not ordered him killed, but was pierced from one side to the other with a sword by a legionary. 
Galba was the sixth Roman emperor, ruling from AD 68 to 69. After his adoption by his stepmother, and before becoming emperor, he was known as Livius Ocella Sulpicius Galba. He was the first emperor in the Year of the Four Emperors and assumed the throne following Emperor Nero's suicide.
Nero Claudius Caesar Augustus Germanicus, was the fifth Roman emperor and final emperor of the Julio-Claudian dynasty, reigning from AD 54 until his death in AD 68. He was adopted by the Roman emperor Claudius at the age of 13 and succeeded him on the throne. Nero was popular with the members of his Praetorian Guard and lower-class commoners in Rome and its provinces, but he was deeply resented by the Roman aristocracy. Most contemporary sources describe him as tyrannical, self-indulgent, and debauched. After being declared a public enemy by the Roman Senate, he committed suicide at age 30.
Marcus Otho was the seventh Roman emperor, ruling for three months from 15 January to 16 April 69. He was the second emperor of the Year of the Four Emperors.
Aulus Vitellius was Roman emperor for eight months, from 19 April to 20 December AD 69. Vitellius was proclaimed emperor following the quick succession of the previous emperors Galba and Otho, in a year of civil war known as the Year of the Four Emperors. Vitellius was the first to add the honorific cognomen Germanicus to his name instead of Caesar upon his accession. Like his direct predecessor, Otho, Vitellius attempted to rally public support to his cause by honoring and imitating Nero who remained widely popular in the empire.
AD 69 (LXIX) was a common year starting on Sunday of the Julian calendar. At the time, it was known as the Year of the Consulship of Augustus and Rufinus. The denomination AD 69 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
Ofonius Tigellinus (c. 10 – 69) was a prefect of the Roman imperial bodyguard, known as the Praetorian Guard, from 62 until 68, during the reign of emperor Nero. Tigellinus gained imperial favour through his acquaintance with Nero's mother Agrippina the Younger, and was appointed prefect upon the death of his predecessor Sextus Afranius Burrus, a position Tigellinus held first with Faenius Rufus and then Nymphidius Sabinus.
The Praetorian Guard was a unit of the Imperial Roman army that served as personal bodyguards and intelligence agents for the Roman emperors. During the Roman Republic, the Praetorian Guard were an escort for high-rank political officials and were bodyguards for the senior officers of the Roman legions. In the year 27 BC, after Rome's transition from Republic to Empire, the first emperor of Rome, Augustus, designated the Praetorians as his personal security escort. For three centuries, the guards of the Roman emperor were also known for their palace intrigues, by which influence upon imperial politics the Praetorians could overthrow an emperor, and then proclaim his successor as the new Caesar of Rome. In AD 312, Constantine the Great disbanded the cohortes praetoriae and destroyed their barracks at the Castra Praetoria.
The Year of the Four Emperors, AD 69, was the first civil war of the Roman Empire, during which four emperors ruled in succession: Galba, Otho, Vitellius, and Vespasian. It is considered an important interval, marking the transition from the Julio-Claudians, the first imperial dynasty, to the Flavian dynasty. The period witnessed several rebellions and claimants, with shifting allegiances and widespread turmoil in Rome and the provinces.
Aulus Caecina Alienus was a Roman general active during the Year of the Four Emperors.
The Battle of Bedriacum refers to two battles fought during the Year of the Four Emperors near the village of Bedriacum, about 35 kilometers (22 mi) from the town of Cremona in northern Italy. The fighting in fact took place between Bedriacum and Cremona, and the battles are sometimes called "First Cremona" and "Second Cremona".
De vita Caesarum, commonly known as The Twelve Caesars, is a set of twelve biographies of Julius Caesar and the first 11 emperors of the Roman Empire written by Gaius Suetonius Tranquillus. The group are: Julius Caesar, Augustus, Tiberius, Caligula, Claudius, Nero, Galba, Otho, Vitellius, Vespasian, Titus, Domitian.
Lucius Calpurnius Piso Frugi Licinianus was a Roman nobleman who lived in the 1st century. He was adopted by the Roman Emperor Galba as his heir to the throne, only to be killed during the Year of Four Emperors on the same day as Galba.
Sempronius Densus was a centurion in the Praetorian Guard in the 1st century. He was bodyguard to the deputy emperor, and is remembered by history for his courage and loyalty in singlehandedly defending his charge from scores of armed assassins, while all his comrades deserted or switched sides.
Titus Flavius T. f. T. n. Sabinus was a Roman politician and soldier. A native of Reate, he was the elder son of Titus Flavius Sabinus and Vespasia Polla, and brother of the Emperor Vespasian.
Cornelius Fuscus was a Roman general who fought campaigns under the Emperors of the Flavian dynasty. During the reign of Domitian, he served as prefect of the imperial bodyguard, known as the Praetorian Guard, from 81 until his death in 86 AD. Prior to this appointment, Fuscus had distinguished himself as one of Vespasian's most ardent supporters during the civil war of 69 AD, known as the Year of the Four Emperors.
Cornelius Laco was a prefect of the Roman imperial bodyguard, known as the Praetorian Guard, under Emperor Galba from 68 until his death on 15 January of AD 69. Laco acceded to this office upon the suicide of the previous emperor Nero, replacing Gaius Ophonius Tigellinus as head of the Guard.
Lucius Salvius Otho Titianus was the elder brother of the Roman Emperor Otho. As a Roman senator, he was consul in the year 52 as the colleague of Faustus Cornelius Sulla Felix, and appointed consul as his brother's colleague for the period from Galba's murder to the end of February. Titianus was given the daily responsibilities of the emperor by Otho when Otho left Rome to halt the advance of Vitellius into Italy. Subsequently, Titianus was appointed generalissimo in charge of the war by Otho and was present at the First Battle of Bedriacum.
Fabius Valens of Anagnia was a Roman commander favoured by Nero. In 69 he was commander of Legio I Germanica based in Germania Inferior. When the troops refused to endorse the new emperor Galba after Nero's death, he had them proclaim Vitellius, the governor of Germania Inferior, as emperor.
Icelus Martianus was a freedman of and adviser to the Roman Emperor Servius Sulpicius Galba. After Galba was deposed, Icelus was publicly executed by Otho.