View source for 180 BC

=== By place ===

==== Greece ====
* After three years of intriguing against his younger brother Demetrius, including accusing him of coveting the succession to the Macedonian throne and being allied to Rome, [[Perseus of Macedon|Perseus]] persuades his father King [[Philip V of Macedon]] to have Demetrius executed.

==== Roman Republic ====
* [[Roman Republic|Rome]] completes its subjugation of all of Italy with the defeat of the [[Ligures|Ligurians]] in a battle near modern [[Genoa]]. Rome deports 40,000 Ligurians to other areas of the Republic.
* [[Lucca]] becomes a Roman colony.

==== Egypt ====
* [[Ptolemy VI Philometor]], aged 6, rules as co-regent with his mother, [[Cleopatra I of Egypt|Cleopatra I]], who, although a daughter of a [[Seleucid]] king, does not take King [[Seleucus IV Philopator|Seleucus IV's]] side and remains on friendly terms with Rome.
* Following the death of [[Aristophanes of Byzantium]], [[Aristarchus of Samothrace]] becomes librarian at [[Alexandria]].

==== Bactria ====
* [[Demetrius I of Bactria|Demetrius I]] starts his invasion of present-day Pakistan, following the earlier destruction of the [[Mauryan dynasty]] by general [[Pushyamitra Shunga]].
* [[Apollodotus I]], a general with Demetrius I of Bactria, becomes king of the western and southern parts of the Indo-Greek kingdom, from [[Taxila (ancient)|Taxila]] in [[Punjab, Pakistan|Punjab]] to the areas of [[Sindh]] and possibly [[Gujarat]]. He maintains his allegiance to Demetrius I.

==== China ====
* [[September 26]] – [[Lü Clan Disturbance]]. Following the death of [[Empress Lü]], who had been the de facto ruler of the [[Han dynasty]], the Lü Clan is overthrown and massacred by the imperial princes [[Liu Zhang (prince)|Liu Zhang]] and [[Liu Xiang, Prince of Qi|Liu Xiang]], General-in-Chief [[Zhou Bo]] and Prime Minister [[Chen Ping (Han dynasty)|Chen Ping]]. 
* Fearing reprisals should the young [[Emperor Houshao of Han|Emperor Houshao]] and his brothers reach adulthood, the conspirators deny that [[Emperor Hui of Han|Emperor Hui]] was the father of Houshao and his brothers. They overthrow the emperor, and despite the imperial pedigree of Liu Xiang as the son of the eldest son of [[Gaozu of Han]], they eventually agree to elevate Gaozu's oldest surviving son, [[Emperor Wen of Han|Emperor Wen]], to the throne. After being evicted from the palace, Houshao is executed later in the year.
* Emperor Wen honours the relatives and ancestors of [[Zhao Tuo]], the Chinese-born ruler of [[Nanyue]] (in present-day Vietnam and southern China). As a result, Nanyue [[Southward expansion of the Han dynasty|returns]] to the [[Han dynasty]] as a vassal, although Zhao Tuo continues to call himself an emperor within his own kingdom. 
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