900

Year 900 (CM) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar.

Events

By place

Asia

• Gyeonhwon formally establishes the kingdom of Hubaekje in southwestern Korea.
• Namwaran and his children, Lady Angkatan and Bukah, are granted pardon by the Datu of Tondo, as represented Jayadewa, Lord Minister of Pila, which released them of all their debts as inscribed in the Laguna Copperplate Inscription, Philippines.

Europe

• Harald Fairhair (of the Yngling or Scilfing Dynasty) subdues the petty kings of Norway and conquers the Orkney and Shetland Islands.

By topic

Religion

• February—Pope Benedict IV succeeds Pope John IX as the 117th pope.

Medicine

• The Persian scientist Rhazes distinguishes smallpox from measles in the course of his writings. Holding against any sort of orthodoxy, particularly Aristotle's physics, he maintains "the conception of an 'absolute' time, regarded by him as a never-ending flow".

Births

• Abu Jafar Khazeni, Persian astronomer and mathematician