12 events the sources record for this year, grouped by region.
What happened
China (1)
In this year, the Governor of Youzhou, Wang Xiong, had his brave man Han Long assassinate the Xianbei Kebineng. (Zizhi Tongjian (Comprehensive Mirror) 卷073 235년 단락12 제1문)
Southern Europe (6)
Alexander is killed, with a few companions, in "a village called Sicily in Britain" by soldiers who resented his strict discipline. (Aurelius Victor, De Caesaribus Aur. Vict. Caes. 24.4)
Alexander dies in Gaul in a soldiers' riot. He was devoted to his mother. (Eutropius, Breviarium Eutr. 8.23)
Camped with a small force at a village called Sicilia in Britain (or Gaul), he is killed by his soldiers (Historia Augusta Alex. Sev. 59.6)
After Alexander's death Maximinus is acclaimed Augustus by the army without a Senate decree, and his son becomes co-ruler (Historia Augusta Max. duo 8.1)
Leading the whole army across the Rhine, he burns villages 30 to 40 miles into Germany and fights a kind of naval battle in the marshes (Historia Augusta Max. duo 11.7, 12.1, 12.4)
The Pannonian and Moesian armies revolt and raise Maximinus to emperor; Alexander, near the Rhine, is killed with his mother Mamaea in a tumult of the crowd. (Zosimus, New History Zos. 1 (1814 영역) p.11)
Western Europe (5)
Alexander tries to buy peace through envoys and passes the time with chariot races and the like, enraging the soldiers. (Herodian, History of the Empire 6.7)
During a review the soldiers dress Maximinus in purple and have him hailed as emperor. He first refuses, then accepts at swordpoint. (Herodian, History of the Empire 7.1)
Tribunes and centurions sent by Maximinus burst into Alexander's tent and kill mother and son. His 14-year reign ends. (Herodian, History of the Empire 7.1)
Centurions including Magnus try to cut the Rhine bridge and strike Maximinus, but are exposed. Quartinus is made emperor against his will and then betrayed. (Herodian, History of the Empire 7.1)
Maximinus crosses the Rhine and pursues Germans hiding in forests and marshes. He rides into a lake to fight, and the marsh is filled with corpses. (Herodian, History of the Empire 7.2)