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Years: 250Events Diophantus writes Arithmetica the first systematic treatise on algebra. A group of Franks penetrate as far as Tarragona in Spain (approximate date). Goths invade Moesia. The Alamanni drive the Romans from the modern area of Donau-Ries. Decius begin 251Events Pope Cornelius succeeds Pope Fabian. Battle of Abrittus between Romans and Goths. The persecution of Christians under Decius ends. Herennius Etruscus, Hostilian, and Trebonianus Gallus each succeed Decius as Roman emperor. Births Anthony the Great 252Events Sun Liang succeeds Sun Quan as king of the Chinese Kingdom of Wu. Pope Cornelius is imprisoned by Roman emperor Trebonianus Gallus. Valerian recreated Legio III Augusta to fight the Berbers. Births Deaths Sun Quan, Chinese warlord and founder of th 253For the book see 253 (book . Events Pope Lucius I succeeds Pope Cornelius. Aemilianus becomes Roman emperor. Valerian I becomes Roman emperor. He appoints his son Gallienus as his junior colleague. Births Deaths Pope Cornelius Aemilianus, Roman emperor Tr 254Events Pope Stephen I succeeds Pope Lucius I Wei Gao Gui Xiang Gong succeeds Cao Fang as king of the Chinese Kingdom of Wei Births Deaths Cao Fang, Chinese king of Wei, assassinated 254. 255Events Births Deaths Wuqiu Jian, general of the Kingdom of Wei 255. 256Events Births Arius, founder of Arianism Deaths 256. 257Events Pope Sixtus II succeeds Pope Stephen I Births Saint Gregory the Illuminator, founder and patron saint of the Armenian Church (approximate date) Deaths Pope Stephen I 257. 258 259