Year307 (CCCVII) was acommon year starting on Wednesday of theJulian calendar. At the time, it was known as theYear of the Consulship of Severus and Maximinus (or, less frequently,year 1060Ab urbe condita). The denomination 307 for this year has been used since the early medieval period, when theAnno Dominicalendar era became the prevalent method in Europe for naming years.
Galerius sendsValerius Severus with the army ofnorthern Italy, to suppress the rebellion in Rome. However, faced with their former emperorMaximian, the soldiers desert him, and Severus flees toRavenna. Maximian besieges Severus in Ravenna, who then surrenders. Maxentius makes Severus a hostage, in an attempt to keep Galerius at bay.
Summer: Anticipating an offensive by Galerius, Maximian travels toGaul to make an alliance withConstantine I.
Late summer or autumn: Galerius invades Italy but Maxentius remains behind the walls ofRome. Galerius finds he cannot besiege the city, and the image of an emperor making efforts against Rome hurts Galerius' image among the troops. The fact that Maxentius is his son-in-law does not help, and Maxentius makes an effort to bribe Galerius' troops. Galerius unsuccessfully attempts to negotiate, and recognizing Maxentius' attempts at bribery and the danger of being trapped in Italy by Maximian and Constantine, Galerius chooses to withdraw from Italy. To satiate his troops during the withdrawal, he pillages the Italian countryside. Meanwhile, Maxentius executes Severus.
January 8 – EmperorHui of Jin dies after a 16-year reign, in which eightdukes of the imperial family have conducted a civil war (War of the Eight Princes) against each other in a struggle for power.Huai of Jin, age 23, succeeds his father and becomes the third ruler of theJin Dynasty.
