Ruins at Eleusis (Greece). View over the excavation site towards the Saronic Gulf.
By place
Roman Empire
Emperor Marcus Aurelius forms a new military command, the praetentura Italiae et Alpium. Aquileia is relieved, and the Marcomanni are evicted from Roman territory.
Emperor Marcus Aurelius crosses the Danube with an expeditionary force. He subdues the Marcomanni and their allies and then, in a pact signed with the Germanic tribes, he imports them into the Roman Empire to occupy areas that have been depopulated by the plague.
Miracle in Moravia: As the Roman army is encircled by the Quadi under intense heat, a violent thunderstorm sweeps away the Quadi in a torrent of water and mud, and refreshes the parched legionaries.
Avidius Cassius, governor of Syria, suppresses an agrarian revolt in Egypt and is made supreme commander of the Roman army in the East.
Egypt
The Bucolic War broke out in Egypt. The Egyptians, led by Isidorus, fought against the Roman Empire under Marcus Aurelius.
Asia
Last (5th) year of Jianning era and start of Xiping era of the Chinese Han dynasty.
Empress Faustina the Younger accompanies her husband, Marcus Aurelius, on various military campaigns and enjoys the love of the Roman soldiers. Aurelius gives her the title of Mater Castrorum ("Mother of the Camp").
Avidius Cassius fails in seeking support for his rebellion and is assassinated by Roman officers. They sent his head to Aurelius, who persuades the Senate to pardon Cassius's family.
In Hepu and Jiaozhi (modern day Northern Vietnam) during the second Era of Northern Domination, a rebellion led Liang Long broke out and last for three years until it was quelled by general Zhu Jun of the Han dynasty.
Roman legionaries of Legio II Adiutrix engrave on the rock of the Trenčín Castle (Slovakia) the name of the town Laugaritio, marking the northernmost point of Roman presence in that part of Europe.
Marcus Aurelius drives the Marcomanni over the Danube and reinforces the border. To repopulate and rebuild a devastated Pannonia, Rome allows the first German colonists to enter territory controlled by the Roman Empire.
Han dynasty China: The full title of the Nine Chapters on the Mathematical Art appears on two bronze standard measures dated to this year, yet there is speculation that the same book existed beforehand only under different titles. In the 3rd century, Liu Hui would provide commentary on this important early Chinese mathematical treatise.