The 20s decade ran from January 1, AD 20, to December 31, AD 29.
Year 1 BC was a common year starting on Friday or Saturday in the Julian calendar and a leap year starting on Thursday in the proleptic Julian calendar. It was also a leap year starting on Saturday in the Proleptic Gregorian calendar. At the time, it was known as the Year of the Consulship of Lentulus and Piso. The denomination 1 BC 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. The following year is AD 1 in the widely used Julian calendar, which does not have a "year zero".
Gnaeus Calpurnius Piso, was a Roman statesman during the reigns of Augustus and Tiberius. He served as consul in 7 BC, after which he was appointed governor of Hispania and consul of Africa. Piso is best known for being accused of poisoning and killing Germanicus, the heir of emperor Tiberius.
Lucius Calpurnius Piso Caesoninus was a prominent Roman senator of the early Empire. His tenure as pontifex led him sometimes to be called Lucius Calpurnius Piso Pontifex, to differentiate him from his contemporary, Lucius Calpurnius Piso the Augur, consul in 1 BC. He was a confidant of the emperors Augustus and Tiberius.
The gens Cornelia was one of the greatest patrician houses at ancient Rome. For more than seven hundred years, from the early decades of the Republic to the third century AD, the Cornelii produced more eminent statesmen and generals than any other gens. At least seventy-five consuls under the Republic were members of this family, beginning with Servius Cornelius Maluginensis in 485 BC. Together with the Aemilii, Claudii, Fabii, Manlii, and Valerii, the Cornelii were almost certainly numbered among the gentes maiores, the most important and powerful families of Rome, who for centuries dominated the Republican magistracies. All of the major branches of the Cornelian gens were patrician, but there were also plebeian Cornelii, at least some of whom were descended from freedmen.
The gens Calpurnia was a plebeian family at ancient Rome, which first appears in history during the third century BC. The first of the gens to obtain the consulship was Gaius Calpurnius Piso in 180 BC, but from this time their consulships were very frequent, and the family of the Pisones became one of the most illustrious in the Roman state. Two important pieces of Republican legislation, the lex Calpurnia of 149 BC and lex Acilia Calpurnia of 67 BC were passed by members of the gens.
Lucius Gellius was a Roman politician and general who was one of two Consuls of the Republic in 72 BC along with Gnaeus Cornelius Lentulus Clodianus. A supporter of Pompey, he is noted for being one of the consular generals who led Roman legions against the slave armies of Spartacus in the Third Servile War.
Gnaeus Cornelius Lentulus Gaetulicus was a Roman senator and general. He was ordinary consul in the year 26 with Gaius Calvisius Sabinus as his colleague. Gaetulicus was involved in a plot against the emperor Caligula, and following its discovery he was executed.
Marcus Vinicius was twice Roman consul and, as husband of Julia Livilla, grandson-in-law (progener) of the emperor Tiberius. He was the son and grandson of two consuls, Publius Vinicius and Marcus Vinicius.
Lucius Apronius was a Roman senator and suffect consul in 8 AD.
Marcus Licinius Crassus Frugi was a Roman nobleman of consular rank who lived during the Roman Empire. Frugi's mother was an unnamed Roman woman, while his father was consul and governor Marcus Licinius Crassus Frugi. Frugi's adoptive paternal grandfather was consul and general Marcus Licinius Crassus the Younger. Crassus was the grandson of triumvir Marcus Licinius Crassus and the last known direct descendant of his grandfather. He had a daughter called Licinia who married the consul Lucius Calpurnius Piso; their son, Gaius Calpurnius Piso, was a conspirator against the Emperor Nero.
Gaius Calvisius Sabinus was a Roman Senator, who was consul in AD 26 as the colleague of Gnaeus Cornelius Lentulus Gaetulicus. During the reign of Caligula, he was accused of conspiring against the emperor, and took his own life rather than submit to a trial.
Gnaeus Cornelius Lentulus "Augur" was a politician and general of the early Roman Empire during the reign of Augustus, who became consul in 14 BC as the colleague of Marcus Licinius Crassus Frugi. Enormously wealthy, he reputedly was forced by emperor Tiberius to commit suicide in 25 AD.
Lucius Cornelius Lentulus was a Roman politician and military officer who served as consul in 3 BC.
Lucius Calpurnius Piso was a Roman senator who was appointed consul in 1 BC as the colleague of Cossus Cornelius Lentulus Gaetulicus. He was also an augur.
Lucius Nonius Asprenas was a Roman Senator who was active in the reigns of Augustus and Tiberius. Asprenas was appointed suffect consul to replace Lucius Arruntius on 1 July AD 6.
Cossus Cornelius Lentulus was a Roman senator, who was active during the reign of Tiberius. He was consul in the year AD 25 as the colleague of Marcus Asinius Agrippa. Except for his consulship, the only office Lentulus might have held is governorship of Germania Superior, as Edmund Groag conjectured.
Gaius Calpurnius Acilius Aviola was a senator of the Roman Empire. He was suffect consul in AD 24 with Publius Cornelius Lentulus Scipio as his colleague. Aviola is also recorded as being governor of Asia in 37/38. Aviola has been identified as the father of Manius Acilius Aviola, consul in 54.