Centuries: 1st century - 2nd century - 3rd century
Decades: 120s 130s 140s 150s 160s - 170s - 180s 190s 200s 210s 220s
Years: 170 171 172 173 174 - 175 - 176 177 178 179 180
- Pope Eleuterus succeeds Pope Soter (approximate date)
- Roman emperor Marcus Aurelius defeats the Marcomanni.
- Zhou Yu, militarist and strategist of the Three Kingdoms of China