Science & Discovery in the 3rd century

9 sourced entries, 229 CE to 295 CE, oldest first. Also see Science & Discovery across every century or everything else in the 3rd century.

• 229Ammonius Saccas renews Greek philosophy by creating Neoplatonism.source
• 239Queen of Yamataikoku (Japan), Himiko was given Golden signature stamp by Cao Wei (China)source
• 250Classic period of Mesoamerican civilization begins.source
• 250Diophantus writes Arithmetica, the first systematic treatise on algebra.source
• 260Earliest known date of chess (approximate date).source
• 263Chinese mathematician Liu Hui writes a commentary on The Nine Chapters on the Mathematical Art, describing what will later be called Gaussian elimination, computing pi, etc.source
• 271A magnetic compass is first used in China.source
• 292The jurist Gregorius, at the court of Emperor Diocletian, produces the Gregorian Code, the first codification of Roman law (approximate date).source
• 295The jurist Hermogenianus, at the court of Diocletian, produces the Hermogenian Code. This new codification of Roman law complements the Gregorian Code of c. 292.source