7 events the sources record for this year, grouped by region.
What happened
China (1)
The Jin court sent the Youzhou army to attack Murong Hui; they fought at Feiru, and Hui's forces were greatly defeated. (Zizhi Tongjian (Comprehensive Mirror) 卷081 285년 단락4 제4문)
Korean Peninsula (1)
In the sixteenth year, when King Ahwa of Baekje dies, the emperor summons Prince Jikji, sends him home to ascend the throne, and gives him the land of Donghan (Nihon Shoki (Chronicles of Japan) 日本書紀 卷第十 応神紀 16年 단락30)
Southern Europe (5)
Carinus, fighting Diocletian in Moesia beside the River Marcus, is killed by his own soldier. (Aurelius Victor, De Caesaribus Aur. Vict. Caes. 39.11)
When peasants and brigands (Bagaudae) in Gaul plunder the fields and menace the cities, Diocletian sends Maximian, and Herculius soon pacifies them. (Aurelius Victor, De Caesaribus Aur. Vict. Caes. 39.17)
Diocletian defeats the universally hated Carinus in a great battle at Margus. Carinus is betrayed by his army. (Eutropius, Breviarium Eutr. 9.20)
When Gallic peasants rise under the name Bagaudae, Diocletian sends Maximian as Caesar, who puts them down in light fighting. (Eutropius, Breviarium Eutr. 9.20)
Carinus fights Diocletian several times and is defeated and killed in a battle near Margus (Historia Augusta Car. 18.2)