What Happened in 866 AD
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- Nov 13 Pope Nicholas I answers the envoys of Boris (Ad consulta vestra)
- Jun 10 Uda, 59th Emperor of Japan (887-897), born in Heian Kyō (Kyōto), Japan (d. 931)
- Sep 19 Leo VI (the Wise), Byzantine Emperor (886-912) and writer (Problematica), born in Constantinople (d. 912)
- Jan 10 Lin-chi I-hsuan [J Rinzai Gigen], Zen teacher, dies
- May 27 Ordono I, King of Asturia (850-66), dies
- Sep 15 Robert the Strong, Margrave of Neustria
- F 1
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List of Years
Gregory I
Gregory XIII
Julius II
Julius III
Leo X
Pius V