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212: Constitutio Antoniniana grants citizenship to all free Roman men 212-216: Baths of Caracalla 230-232: Sassanid dynasty of Persia launches a war to reconquer lost lands in the Roman east 235-284: Crisis of the Third Century shakes Roman Empire 250-538: Kofun era, the first part of the Yamato period in Japan 258: Valerian's Massacre of Christians 260: Roman Emperor Valerian I is taken captive by Shapur I of Persia 184-280: Period of the Three Kingdoms 280-420: Jin Dynasty (265-420) of China Sarnath becomes a center of Buddhist arts in India Diffusion of maize as a food crop from Mexico into North America begins The Kingdom of Funan reaches its zenith under the rule of Fan Shih-man The Goths move from Gothiscandza to Ukraine and shape the Chernyakhov culture

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Clement of Alexandria Diocletian, Roman emperor Diophantus of Alexandria, wrote Arithmetica Hippolytus, considered first Antipope Liu Hui, Chinese mathematician Mani (prophet), founder of Manichaeism Origen Pappus of Alexandria, Greek mathematician Plotinus, founder of Neoplatonism Tertullian, sometimes called father of Latin church Wang Pi, Taoist M. Sattonius Iucundus, restorer of the Thermae in Heerlen Zhuge Liang, known as the greatest strategist during the period of the Three Kingdoms Liu Bei, founding emperor of the Kingdom of Shu Cao Cao, founding emperor of the Kingdom of Wei

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A primitive form of glasses were developed for a nearsighted princess in Syria.

Compass invented in China

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