6 events the sources record for this year, grouped by region.
What happened
China (1)
In this year the Hu chief Tai Ahou from outside the frontier, leading twenty-nine thousand three hundred households, came to surrender, and was settled inside the frontier at Xihe. (Zizhi Tongjian (Comprehensive Mirror) 卷081 284년 단락2 제1문)
Southern Europe (5)
When the stench of Numerian's body exposes the plot, the generals and tribunes choose Diocletian, commander of the guard, as emperor. (Aurelius Victor, De Caesaribus Aur. Vict. Caes. 39.1)
Numerian, carried in a litter because of an eye ailment, is killed through a plot by his father-in-law Aper, and the stench of the body reveals it only days later. (Eutropius, Breviarium Eutr. 9.18)
The victorious army, having lost Carus to lightning and Numerian to a plot, hands the throne to Diocletian, from Dalmatia. (Eutropius, Breviarium Eutr. 9.19)
Numerian, riding in a litter because of an eye ailment, is killed in a plot by his father-in-law Aper (Historia Augusta Car. 12.1)
Diocletian mounts the platform and is acclaimed Augustus, then stabs the praetorian prefect Aper with a sword, saying he killed Numerian (Historia Augusta Car. 13.2)