280s BC 270s BC 260s BC 250s BC - - 230s BC 220s BC 210s BC 200s BC 190s BC
250 BC 249 BC 248 BC 247 BC - - 245 BC 244 BC 243 BC 242 BC 241 BC
- In Rome , the number of Praetor s is increased from one to two
- An irrigation canal approximately one hundred miles long was built across the current-day province of Shenxi in China, greatly adding to the agricultural productivity of the area and to the military potency of the Qin dynasty.
- Seleucus II Callinicus becomes King of the Seleucid Dynasty .
- Ptolemy III becomes King of Egypt .
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