Who Died in 855 AD
- Jul 17 Leo IV, Italian Pope (reigned 847-55), dies
- Jul 31 Imam Ahmad ibn Hanbal, Muslim Jurisprudent (b. 780)
- Sep 25 Lothair, King of the Franks and Holy Roman Emperor, at about 60 [born c. 795]
- Sep 29 Lotharius I, Romanian-French emperor (signed Treaty of Verdun), dies
Gregory I
Gregory XIII
Julius II
Julius III
Leo X
Pius V