1 BC

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Rhombicuboctahedron by Leonardo da Vinci

Year 1 BC was a common year starting on Friday or Saturday (link will display the full calendar) of the Julian calendar (the sources differ, see leap year error for further information) and a leap year starting on Thursday of the Proleptic Julian calendar. At the time, it was known as the Year of the Consulship of Lentulus and Piso (or, less frequently, year 753 Ab urbe condita). 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. It was also the year 10,000 of the Holocene calendar.

Events

Emperor Augustus sent his stepson Gaius Caesar as army commander to the East and made a peace treaty with Phraates V on an island in the river Euphrates.
Ovid writes the Ars Amatoria.

Emperor Ai of Han dies and is succeeded by his cousin Ping of Han (1 BC – 6 AD), a boy of nine years old. Wang Mang is appointed regent by the Grand Empress Dowager Wang.

Incarnation of Jesus (conception on 25 March and birth on 25 December), as assigned by Dionysius Exiguus in his anno Domini era according to most scholars (Dionysius used the word "incarnation", but it is not known whether he meant conception or birth). However, at least one scholar thinks Dionysius placed the incarnation of Jesus in the next year, AD 1. Most modern scholars do not consider Dionysius' calculations authoritative, placing the event several years earlier (see Chronology of Jesus).