Agrippina the Elder in the context of "Germanicus"

Gaius Caesar Augustus Germanicus (31 August 12 – 24 January 41), also called Gaius and Caligula (/kəˈlɪɡjʊlə/), was Roman emperor from AD 37 until his assassination in 41. He was the son of the Roman general Germanicus and Augustus' granddaughter Agrippina the Elder, members of the first ruling family of the Roman Empire. He was born two years before Tiberius became emperor. Gaius accompanied his father, mother and siblings on campaign in Germania, at little more than four or five years old. He had been named after Gaius Julius Caesar, but his father's soldiers affectionately nicknamed him "Caligula" ('little boot').

Germanicus died in Antioch in AD 19, and Agrippina returned with her six children to Rome, where she became entangled in a bitter feud with Emperor Tiberius, who was Germanicus' biological uncle and adoptive father. The conflict eventually led to the destruction of her family, with Caligula as the sole male survivor. In 26, Tiberius withdrew from public life to the island of Capri, and in 31, Caligula joined him there. Tiberius died in 37, and Caligula succeeded him as emperor, at the age of 24.

Julia Agrippina (6 November AD 15 – 23 March AD 59), also referred to as Agrippina the Younger, was Roman empress from AD 49 to 54, the fourth wife and niece of emperor Claudius, and the mother of Nero.

Agrippina was one of the most prominent women in the Julio-Claudian dynasty. She was the great-granddaughter of Augustus (the first Roman emperor) and the daughter of the Roman general Germanicus and Agrippina the Elder. Her father, Germanicus, was the nephew and heir apparent of the second emperor, Tiberius. Agrippina's brother Caligula became emperor in AD 37. After Caligula was assassinated in AD 41, Germanicus' brother Claudius took the throne. Agrippina married Claudius in AD 49.

Marcus Agrippa Postumus (12 BC – AD 14), later named Agrippa Julius Caesar, was a grandson of Roman Emperor Augustus. He was the youngest child of Marcus Vipsanius Agrippa and Julia the Elder. Augustus initially considered Postumus as a potential successor and formally adopted him as his heir, before banishing Postumus from Rome in AD 6 on account of his ferocia ("beastly nature"). In effect, though not in law, the action cancelled his adoption and virtually assured Tiberius' emplacement as Augustus' sole heir. Postumus was ultimately executed by his own guards shortly after Augustus' death in AD 14.

Postumus was a member of the Julio-Claudian dynasty, the first imperial family of the Roman Empire. His maternal grandparents were Augustus and his second wife, Scribonia. Postumus was also a maternal uncle of Emperor Caligula, who was the son of Postumus' sister Agrippina the Elder, as well as a great-uncle of Nero, the last Julio-Claudian emperor, whose mother, Agrippina the Younger, was Caligula's sister.