181 BC

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Millennium: 1st millennium BC
181 BC in various calendars
Gregorian calendar181 BC
Ab urbe condita573
Ancient Egypt eraXXXIII dynasty, 143
- PharaohPtolemy V Epiphanes, 23
Ancient Greek era149th Olympiad, year 4
Assyrian calendar4570
Balinese saka calendarN/A
Bengali calendar−773
Berber calendar770
Buddhist calendar364
Burmese calendar−818
Byzantine calendar5328–5329
Chinese calendar己未年 (Earth Goat)
2516 or 2456
    — to —
庚申年 (Metal Monkey)
2517 or 2457
Coptic calendar−464 – −463
Discordian calendar986
Ethiopian calendar−188 – −187
Hebrew calendar3580–3581
Hindu calendars
 - Vikram Samvat−124 – −123
 - Shaka SamvatN/A
 - Kali Yuga2920–2921
Holocene calendar9820
Iranian calendar802 BP – 801 BP
Islamic calendar827 BH – 826 BH
Javanese calendarN/A
Julian calendarN/A
Korean calendar2153
Minguo calendar2092 before ROC
Nanakshahi calendar−1648
Seleucid era131/132 AG
Thai solar calendar362–363
Tibetan calendar阴土羊年
(female Earth-Goat)
−54 or −435 or −1207
    — to —
(male Iron-Monkey)
−53 or −434 or −1206

Year 181 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Cethegus and Tamphilus (or, less frequently, year 573 Ab urbe condita). The denomination 181 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.


By place[edit]


Roman Republic[edit]

  • Rome founds a colony at Aquileia, on the narrow strip of land between the mountains and the lagoons, as a frontier fortress to check the advance of the Illyrians.

Asia Minor[edit]

  • Pharnaces I of Pontus decides to attack both Eumenes II of Pergamum and Ariarathes IV of Cappadocia and therefore invades Galatia with a large force. Eumenes leads an army to oppose him, however, hostilities are soon suspended following the arrival of Roman deputies, who have been appointed by the Roman Senate to inquire into the matters in dispute. Negotiations take place at Pergamum but are inconclusive, with Pharnaces' demands being rejected by the Romans as unreasonable. As a consequence, the war between Pontus and Pergamum and Cappadocia is renewed.


  • Empress Lü of the Han Dynasty sends an army under Zhou Zao to attack the formerly vassal state of Nanyue in present-day Vietnam and southern China, but the heat and dampness causes many of Zhou's men to fall ill, and he fails to make it across the mountains into enemy territory.
  • Nanyue's emperor Zhao Tuo attacks the other vassal kingdoms of Minyue, Western Ou and Luo and secures their submission. He also attacks the state of Changsha.