857 deaths

'''Abu al-Hasan 'Ali Ibn Nafi (; 789– 857), commonly known as Ziryab,''' was a singer, oud and lute player, composer, poet, and teacher. He lived and worked in what is now Iraq, Northern Africa, and Andalusia during the medieval Islamic period. He was also a polymath, with knowledge in astronomy, geography, meteorology, botanics, cosmetics, culinary art, and fashion.

9th-century Spanish Orthodox bishop and saint

thumb|De consolatione medicinarum, 1475

Al-Muḥāsibī () (781–857 CE) was a Muslim Arab, theologian, philosopher and ascetic. He is considered to be the founder of the Baghdad School of Islamic philosophy which combined Kalam and Sufism, and a teacher of the Sufi masters Junayd al-Baghdadi and Sirri Saqti.

Erispoe (; ; died 2 or 12 November 857) was Duke of Brittany from 851 to his death. After the death of his father Nominoe, he led a successful military campaign against the Franks, culminating in his victory at the Battle of Jengland. He is subsequently referred to as "King of Brittany".

King of Balhae

Silla ruler

Spanish saint

chief Qadi of the Abbasid Caliphate

Chinese chancellor

King of Ulaid