9 events the sources record for this year, grouped by region.
What happened
China (7)
The rebellion of the Seven States: the kings of Wu, Chu, Jiaoxi, Zhao, Jinan, Zichuan and Jiaodong raised troops; they beheaded Chao Cuo to apologize to the seven states, but were suppressed. (Book of Han (Hanshu), Imperial Annals 漢書卷005 景帝前元三年正月)
Grand Commandant Zhou Yafu and Grand General Dou Ying defeated the Seven States and took over 100,000 heads; the kings of Jiaoxi, Chu, Zhao and others killed themselves. (Book of Han (Hanshu), Imperial Annals 漢書卷005 景帝前元三年(正月~六月))
The seven states, including Wu and Chu, rebelled and executed Chao Cuo. Yuan Ang tried to dissuade them, but they did not stop and marched west to besiege Liang at Suiyang. (Records of the Grand Historian (Shiji), Annals 史記卷011 孝景本紀)
Grand General Dou Ying and Grand Commandant Zhou Yafu were sent to attack the seven states, and in the sixth month a general pardon and merit rewards were granted. (Records of the Grand Historian (Shiji), Annals 史記卷011 孝景本紀)
The rebellion of the Seven States of Wu and Chu: when Chao Cuo's document reached the commanderies of Kuaiji and Yuzhang in Wu, the King of Wu rose first and killed officials of two thousand shi and below; Jiaoxi, Jiaodong, Zichuan, Jinan, Chu and Zhao also rebelled. (Zizhi Tongjian (Comprehensive Mirror) 資治通鑑 卷016 (원문 단락 #1179, -154년))
The three kings besieged Linzi; the Emperor had the Lu-zhong daifu, envoy of the King of Qi, convey the message: 'The Han army will soon defeat Wu and Chu, so hold firm'; but the siege had several layers and he could not get in. (Zizhi Tongjian (Comprehensive Mirror) 資治通鑑 卷016 (원문 단락 #1193, -154년))
Southern Europe (2)
Opimius gathers an army at Placentia and marches into Liguria (Polybius, Histories 33.11)
In summer, Roman envoys mediate a settlement between Prusias and Attalus (Polybius, Histories 33.13)