Pope Sixtus II succeeds Pope Stephen I as the 24th pope. Valerian, under guardianship of Ingenuus, is established at Sirmium (Pannonia) to represent the Roman government in the troubled Illyrian provinces. In Bavaria the Limes Germanicus (Upper Raetian Limes) along the river Iller is abandoned by the Romans.
Geopolitics & Diplomacy
Emperor Gallienus brings some order to the Danube area.source
Valerian, under guardianship of Ingenuus, is established at Sirmium (Pannonia) to represent the Roman government in the troubled Illyrian provinces.source
Conflict & Security
Emperor Valerian recovers Antioch, Syria from King Shapur I of Persia.source
Future emperor Aurelian defeats the Goths and brings many prisoners back to Rome.source
August 30 – Pope Sixtus II succeeds Pope Stephen I as the 24th pope.source
Valerian's persecution of Christians begins: his edict orders bishops and priests to sacrifice according to the pagan rituals, and prohibits Christians, under penalty of death, from meeting at the tombs of their deceased.source
The Goths separate into the Ostrogoths and the Visigoths.source
Climate & Environment
In Bavaria the Limes Germanicus (Upper Raetian Limes) along the river Iller is abandoned by the Romans.source
Births
Gregory the Illuminator, Armenian religious leader (approximate date)source
Jia Nanfeng (or Shi), Chinese empress (d. 300)source