5 events the sources record for this year, grouped by region.
What happened
China (1)
Crown Prince Dan of Yan sent Jing Ke to stab the King of Qin but failed; Wang Jian and Xin Sheng attacked Yan and broke them west of the Yi River. (Records of the Grand Historian (Shiji), Annals 史記卷006 秦始皇本紀)
Southern Europe (4)
The ephors send Cleomenes to occupy the precinct of the temple of Athena Belbina (Plutarch's Parallel Lives Plut. Agis&Cleomenes 4)
Near Mount Lycaeum he attacks and routs the withdrawing Achaean army (Plutarch's Parallel Lives Plut. Agis&Cleomenes 5)
Cleomenes sends assassins to the ephors' table and stages a coup (Plutarch's Parallel Lives Plut. Agis&Cleomenes 8)