The 50s decade ran from January 1, 50, to December 31, 59. It was the sixth decade in the Anno Domini/Common Era, if the nine-year period from 1 AD to 9 AD is considered as a "decade".
The early years of the decade saw Roman and Parthian intervention in the Iberian–Armenian War, a conflict which led Tiridates I to become King of Armenia with Parthian support. This was unacceptable to Rome, and the ensuing tensions culminated in the Roman–Parthian War of 58–63. Concurrently, the Roman conquest of Britain continued, with Caratacus being defeated in 50 and tribes of modern Wales being subdued in 58 to 59. In 50, the Southern Xiongnu submitted to the Chinese Han dynasty. Later in 57, the ascension of Emperor Ming heralded the beginning of a golden age.
The Council of Jerusalem was held early in the decade: The council decided that Gentile converts to Christianity were not obligated to keep most of the fasts, and other specific rituals, including the rules concerning circumcision of males. The Council did, however, retain the prohibitions on eating blood, meat containing blood, and meat of animals that were strangled, and on fornication and idolatry.
Literary works of this decade include De Vita Beata (which explains that the pursuit of happiness is the pursuit of reason) and De Clementia (an instructional contrast between the good ruler and a tyrant), both of which were written by Seneca the Younger.
Manning (2008) tentatively estimates the world population in AD 50 as 248 million.
Due to lack of reliable demographic data, estimates of the world population in the 1st century vary wildly, with estimates for AD 1 varying from 150 to 300 million. Demographers typically do not attempt to estimate most specific years in antiquity, instead giving approximate numbers for round years such as AD 1 or AD 200. However, attempts at reconstructing the world population in more specific years have been made, with Manning (2008) tentatively estimating the world population in AD 50 as 248 million.
Cologne is raised to the status of a city.
Utrecht is founded, and a Roman fortification (castellum) is constructed at the Rhine border in the present-day Netherlands.
Roman emperor Claudius appoints Agrippa II governor of Chalcis.
In Judaea, a Roman soldier seizes and burns a Torah scroll. Procurator Cumanus has the culprit beheaded, calming down local Jews and delaying for almost two decades the outbreak of their revolt.
The Apostles hold the Council of Jerusalem (approximate date).
Paul travels to Philippi, Thessaloniki, Beroea, and Athens (second missionary journey).
The Epistle to the Romans is written (approximate date).
Hero of Alexandria invents a steam turbine (possible date).
Pamphilus of Alexandria writes a poetic lexicon.
Pedanius Dioscorides describes the medical applications of plants in De Materia Medica.
In Britain, governor Publius Ostorius Scapula begins his campaign against the recalcitrant Silures of south Wales, who are led by the former Catuvellaunian prince Caratacus. London (Londinium), Exeter (Isca Dumnoniorum), Tripontium (near modern Rugby) and the fort of Manduessedum (near modern Atherstone) are founded (approximate date).
Romans build a wooden bridge across the Thames in the London area.