Information: - Tiberius (16 November 42 BC 16 March 37 AD) was a Roman Emperor from 14 AD to 37 AD. Born Tiberius Claudius Nero, a Claudian, Tiberius was the son of Tiberius Claudius Nero and Livia Drusilla. His mother divorced Nero and married Octavian, later known as Augustus, in 39 BC, making him a step-son of Octavian. - The Roman Empire (Koine and Medieval Greek: , tr. ) was the post-Roman Republic period of the ancient Roman civilization, characterized by government headed by emperors and large territorial holdings around the Mediterranean Sea in Europe, Africa and Asia. The city of Rome was the largest city in the world BC AD, with Constantinople (New Rome) becoming the largest around 500 AD, and the Empire's populace grew to an estimated 50 to 90million inhabitants (roughly 20% of the world's population at the time). The 500-year-old republic which preceded it was severely destabilized in a series of civil wars and political conflict, during which Julius Caesar was appointed as perpetual dictator and then assassinated in 44 BC. Civil wars and executions continued, culminating in the victory of Octavian, Caesar's adopted son, over Mark Antony and Cleopatra at the Battle of Actium in 31 BC and the annexation of Egypt. Octavian's power was then unassailable and in 27 BC the Roman Senate formally granted him overarching power and the new title "Augustus", effectively marking the end of the Roman Republic. - Livia Orestilla , or Cornelia Orestilla was a Roman Empress as the second wife of the Emperor Caligula in AD 37 or 38 . She was originally married to Gaius Calpurnius Piso ( in particular the one involved in a conspiracy to overthrow the emperor Nero in AD 65 ) , who was persuaded or forced to annul the marriage so that Caligula could marry her . According to both Dio and Suetonius , this occurred during Piso and Orestilla 's wedding celebrations . Suetonius claims that Caligula issued a proclamation the next day that he had acquired a new wife in the tradition of Romulus and Augustus , who had both stolen wives from other men . On the next day Caligula divorced with Orestilla ; however , he also prohibited her from getting into a relationship with Piso again . In two years both Orestilla and Piso were banished for adultery to a distant island . - The Principate is the name sometimes given to the first period of the Roman Empire from the beginning of the reign of Augustus in about 30 BC to the Crisis of the Third Century in 284 AD, after which it evolved into the so-called "Dominate". - The term Julio-Claudian dynasty refers to the first five Roman emperorsAugustus, Tiberius, Caligula, Claudius, and Neroor the family to which they belonged. They ruled the Roman Empire from its formation under Augustus in the second half of the 1st century (44/31/27) BC, until AD 68 when the last of the line, Nero, committed suicide. - The Roman emperor was the ruler of the Roman Empire during the imperial period (starting in 27 BC). The emperors used a variety of different titles throughout history. Often when a given Roman is described as becoming "emperor" in English, it reflects his taking of the title "Augustus" or "Caesar". Another title often used was "imperator", originally a military honorific. Early Emperors also used the title "princeps" (first citizen). Emperors frequently amassed republican titles, notably "Princeps Senatus", "Consul" and "Pontifex Maximus". - Gaius Suetonius Tranquillus, commonly known as Suetonius (c. 69 after 122 AD), was a Roman historian belonging to the equestrian order who wrote during the early Imperial era of the Roman Empire. - Gaius Julius Caesar (13 July 100BC 15 March 44BC), known as Julius Caesar, was a Roman politician, general, and notable author of Latin prose. He played a critical role in the events that led to the demise of the Roman Republic and the rise of the Roman Empire. - The conspiracy of Gaius Calpurnius Piso in AD 65 was a major turning point in the reign of the Roman emperor Nero (5468). The plot reflected the growing discontent among the ruling class of the Roman state with Nero's increasingly despotic leadership, and as a result is a significant event on the road towards his eventual suicide and the chaos of the Year of Four Emperors which followed. - Germanicus (24 May 15 BC 10 October AD 19) was a member of the Julio-Claudian dynasty and a prominent general of the early Roman Empire. He was born in Rome, Italia, to Nero Claudius Drusus and his wife Antonia Minor. His original name at birth was either Nero Claudius Drusus after his father, or Tiberius Claudius Nero after his uncle, the second Roman emperor Tiberius. The agnomen "Germanicus" was added to his full name in 9 BC when it was posthumously awarded to his father in honour of his victories in Germania. By AD 4 he was adopted as Tiberius' son and heir. As a result, Germanicus was adopted out of the Claudii and into the Julii. In accordance with Roman naming conventions, he adopted the name Germanicus Julius Caesar. - Caligula, properly Gaius Julius Caesar Augustus Germanicus (31 August AD 12 24 January AD 41) was Roman emperor from AD 3741. Born Gaius Julius Caesar Germanicus (not to be confused with Julius Caesar), Caligula was a member of the house of rulers conventionally known as the Julio-Claudian dynasty. Caligula's biological father was Germanicus, and he was the great-nephew and adopted son of Emperor Tiberius. The young Gaius earned the nickname "Caligula" (meaning "little soldier's boot", the diminutive form of "caliga", hob-nailed military boot) from his father's soldiers while accompanying him during his campaigns in Germania. - Augustus (23 September 63 BC 19 August 14 AD) was the founder of the Roman Principate and considered the first Emperor, controlling the Roman Empire from 27 BC until his death in AD 14. - Gaius Calpurnius Piso was a Roman senator in the 1st century. He was the focal figure in the Pisonian conspiracy of 65 AD, the most famous and wide-ranging plot against the throne of Emperor Nero. Given the information above, choose from the list below the object entity that exhibits the relation 'date of birth' with the subject 'livia orestilla'. Choices: - 10 - 100 - 12 - 14 - 15 - 20 - 23 - 27 - 30 - 31 - 37 - 39 - 42 - 50 - 500 - 65 - 69
The answer to this question is:
20