990 deaths

Japanese writer

Japanese noble

Abu Hamid Ahmed ibn Mohammed al-Saghani al-Asturlabi (, referred to by at least one source as Ṣāghānī, was a Persian astronomer and historian of science. His name means "the astrolabe maker of Saghan, near Merv". He flourished in Baghdad, where he died in 990.

Spanish noble and count of Cerdanya and count of Besalú (c.920-990)

Count of Boulogne

died 990

German count (d. 990)

Dutch bishop

Christian saint

monk of Saint Gall

count of Altdorf and member of the Swabian group of the Elder House of Welf

Folcuin ( 935 – 16 September 990) was a monk at the abbey of Saint-Bertin, where he was a deacon and archivist, and later abbot of Lobbes. He wrote histories of the abbots of both his monasteries.

10th-century Arab physician

Iranian mathematician and astronomer

rabbi

emir of Mosul

Æthelgar (died 990) was Archbishop of Canterbury, and previously Bishop of Selsey.