6 events the sources record for this year, grouped by region.
What happened
China (2)
The Han Zhenbei General Jin Chong and Pingbei General Bu Xu invaded Bingzhou, and on day xinwei surrounded Jinyang. (Zizhi Tongjian (Comprehensive Mirror) 卷088 312년 단락1 제1문)
After Jia Pi and others besieged Chang'an for several months, the Han Prince of Zhongshan, Liu Yao, was defeated again and again; he drove eighty thousand men and women to plunder and fled to Pingyang. (Zizhi Tongjian (Comprehensive Mirror) 卷088 312년 단락15 제1문)
Southern Europe (4)
War spreads in Italy and his men are beaten at Verona, yet Maxentius carries on as usual. (Aurelius Victor, De Caesaribus Aur. Vict. Caes. 40.20)
Maxentius barely gets out to Saxa Rubra, nine miles from Rome, is defeated and flees to Rome, where on the Tiber bridge he is caught in a trap he himself had set and dies. (Aurelius Victor, De Caesaribus Aur. Vict. Caes. 40.23)
Constantine gathers an army of barbarians, Germans, Celts and Britons, 90,000 infantry and 8,000 cavalry, crosses the Alps, spares cities that surrender and storms those that resist. (Zosimus, New History Zos. 2 (1814 영역) p.43)
On the plain before Rome, Constantine's cavalry scatters Maxentius's; Maxentius flees across the bridge, which collapses, and he drowns in the river, and his head is carried into the city on a spear. (Zosimus, New History Zos. 2 (1814 영역) p.44)