Editing 307 (section)

==== Roman Empire ====
* Winter: Emperor [[Galerius]] wins his second victory over the [[Sarmatians]].
* Galerius sends [[Valerius Severus]] with the army of [[northern Italy]], to suppress the rebellion in Rome. However, faced with their former emperor [[Maximian]], the soldiers desert him, and Severus flees to [[Ravenna]]. 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 to [[Gaul]] to make an alliance with [[Constantine I]]. 
* Late summer or autumn: Galerius invades Italy but Maxentius remains behind the walls of [[Rome]]. 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.
* [[December]]: Constantine marries Maximian's daughter [[Fausta]], and is promoted to [[Augustus (title)|Augustus]] by Maximian.<ref>{{cite book |last1=Baker-Brian |first1=Nicholas |last2=Tougher |first2=Shaun |title=The Sons of Constantine, AD 337-361: In the Shadows of Constantine and Julian |date=30 May 2020 |publisher=Springer Nature |isbn=978-3-030-39898-9 |page=197 |url=https://books.google.com/books?id=CT_oDwAAQBAJ&dq=Constantine+307+fausta&pg=PA197 |access-date=8 February 2024 |language=en}}</ref>
* Near the end of the year, Galerius gives his wife ([[Diocletian]]'s daughter) [[Galeria Valeria]] the title of [[Augusta (honorific)|Augusta]].