What is 4?
{{Hatnote|This page is about the year 4&nbsp;AD. For the actual number, see [[4 (number)|4]].}} {{year nav|4}} {{Year in other calendars}} {{wiktionary|four}} The [[year]] '''4''' ('''[[Roman numerals|IV]]''') was a [[leap year]] which started on a [[leap year starting on Tuesday|Tuesday]], according to the [[Julian calendar]].<ref>{{cite web |url= http://www.calendarhome.com/cgi-bin/tycyear.pl?year=4&change=1&suppresshol= |title=CalendarHome.com - 4 |first= |last= |work=calendarhome.com |year=2011 |accessdate=August 4, 2011}}</ref> According to the [[Gregorian calendar]], it started on a [[leap year starting on Thursday|Thursday]].<ref>{{cite web |url= http://www.wolframalpha.com/input/?i=year+4 |title=year 4 - Wolfram&#124;Alpha |first= |last= |work=wolframalpha.com |year=2011 |accessdate=August 4, 2011}}</ref> At the time, it was known as the ''Year of the [[Roman consul|Consulship]] of [[Catus]] and [[Saturninus]]''. It was called the fourth year since the early [[medieval period]], when the [[Anno Domini]] [[calendar era]] became the usual method in [[Europe]] for naming years. It was the 4th year of the [[1st century]]. == Events == === By place === ==== Roman Empire ==== * Emperor [[Caesar Augustus]] summons [[Tiberius]] to Rome, and names him his heir and future emperor. At the same time, [[Agrippa Postumus]] the last son of Marcus Vipsanius Agrippa is also adopted and named as Augustus' heir. * Tiberius also adopts [[Germanicus]] as his own heir. * Sextus Aelius Catus becomes [[Roman consul|consul]]. * The ''[[List of Roman laws|Lex Aelia Sentia]]'' regulates the [[manumission]] of [[slavery|slaves]]. * Signature of a pact of non-aggression and friendship between the [[Roman Empire]], represented by [[Tiberius]], and the German tribe the [[Cherusci]], represented by their King Segimer. [[Arminius]] and Flavus, sons of Segimer, were brought into the Roman army as the Leaders of the auxiliary troops. * [[Julia the Elder]] returns from exile to live in [[Rhegium]] in disgrace. * Augustus Pardons [[Gnaeu