Editing 139 BC (section)

== Events ==
<onlyinclude>
=== By place ===
==== China ====
* [[Emperor Wu of Han]] sends the diplomat [[Zhang Qian]] west to form an alliance with the [[Yuezhi]] against the [[Xiongnu]]. Wu does this after learning from Xiongnu defectors that the Xiongnu had defeated and killed the king of the Yuezhi, had expelled the Yuezhi from their lands and were using their king's skull as a wine goblet. The Yuezhi had subsequently migrated further west. 
* Soon after his departure for the west, Zhang Qian is detained by [[Junchen Chanyu]] of the Xiongnu. He would remain in Xiongnu custody for more than ten years and would be given a Xiongnu wife.<ref>{{cite book|first=Hing Ming|last= Hung|title=The Magnificent Emperor Wu: China's Han Dynasty|year= 2020|isbn=978-1628944167|pages= 144-145}}</ref>
* [[Wei Zifu]] enters Emperor Wu's palace as a concubine and becomes pregnant. Enraged, Liu Piao, the mother of the childless Empress [[Chen Jiao]] (wife of Emperor Wu), kidnaps Zifu's brother [[Wei Qing]], who is rescued by [[Gongsun Ao]]. Wu responds by advancing the careers of members of the Wei family.<ref>{{cite book|first=Hing Ming|last= Hung|title=The Magnificent Emperor Wu: China's Han Dynasty|year= 2020|isbn=978-1628944167|page= 132}}</ref>

==== Roman Republic ====
* The [[Lusitanian War]] ends when the rebellion collapses after the assassination of [[Viriathus]] by a [[Roman Republic|Roman]] agent.
* The [[Achaean League]] is reestablished.

=== By topic ===
==== Astronomy ====
* [[Hipparchus]] makes a very precise determination of the length of the [[synodic month]].
</onlyinclude>