Marcomannic Wars
Germanic tribes break into Italy after nearly three centuries
The Marcomanni and Quadi crossed the Danube and in 170 laid siege to Aquileia. Marcus Aurelius spent most of his remaining years on the Danube front, writing part of his Meditations in camp at Carnuntum and among the Quadi, and died at Vindobona or Sirmium in 180 with the war unfinished.
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Meanwhile around the world (±25 years)
Africa
- c. 150 Ptolemy's Almagest — 16 years earlier
Asia
- 184 The Yellow Turban Rebellion — 18 years later
Alive at the time
- Marcus Aurelius (aged 45)
- Claudius Ptolemy (aged 66)
- Galen (aged 37)
- Nagarjuna (aged 16)
- Cao Cao (aged 11)