5

Millennium:	1st millennium
Centuries:	1st century BC – 1st century – 2nd century
Decades:	20s BC 10s BC 0s BC – 0s – 10s 20s 30s
Years:	2 AD 3 AD 4 AD – 5 AD – 6 AD 7 AD 8 AD

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5 (V) is a common year of the Julian calendar which started on a Thursday.^[1] According to the Gregorian calendar, it started on a Saturday.^[2] It was known as the Year of the Consulship of Messalla and Cinna. It was the 5th year of the 1st century.

It is one of only seven years to use just one Roman numeral. The seven are 1 AD (I), 5 AD (V), 10 AD (X), 50 AD (L), 100 AD (C), 500 AD (D), and 1000 AD (M).

Events

Rome acknowledges Cunobelinus, King of the Catuvellauni, as King of Britain.
Germanic Tribes Cimbri and Charydes send ambassadors to Rome
Gnaeus Cornelius Cinna Magnus, Lucius Valerius Messalla Volesus (or Gaius Ateius Capito) become Roman consuls
Tiberius conquers Germania Inferior
Agrippina the Elder marries Germanicus her second cousin.
Livilla marries Drusus Julius Caesar, Tiberius's son.
Polycharmus Azenius becomes Archon of Athens.

Emperor Ping of Han is assassinated. Grand Empress Dowager Wang appoints Wang Mang as acting-emperor of Han until a suitable successor is found to replace the childless Ping.

Gaius Asinius Pollio, Roman orator, poet and historian (b. 76 or 75 BC)
Ping of Han, Emperor of China is assassinated, poisoned it is believed on the orders of Wang Mang (b. 14 BC).

Evolutionglyph
Seven-segment digital numeral of 5
"256" in text figures with baseline and x-height line
The first Pythagorean triple, with a hypotenuse of 5
The eleven different ways of subdividing a pentagon by adding zero or more non-crossing diagonals. In general, the number of ways of subdividing a convex polygon is counted by the Schröder–Hipparchus numbers.
The smallest non-trivial magic square
Third-order normal magic hexagon in Frénicle standard form. Numbers from 1 to 19 are placed on a hexagonal grid so that each row, in all three directions, add to 38.
This is a magic pentagram with constant M = 24, the simplest such magic pentagram.
Directed graph showing the orbits of the odd numbers less than 50 (with the exceptions of 27, 31, 41, and 47, because they would make it too tall) under the Collatz map.*For a larger graph, see :Image:Collatz-graph-300.svg.*Created with Graphviz, with the help of this
Star with five points, outlined diagonals: Pentagram