820

__NOTOC__

Contents

Events

By Place

Byzantine Empire

Europe

By Topic

Science & Technology

Births

Deaths

Events

By Place

Byzantine Empire

★ Michael II succeeds Leo V as Byzantine Emperor

Europe

★ The Historia Brittonum is written (approximate date)

★ Feidlimid mac Cremthanin assumes the Kingship of Munster

By Topic

Science & Technology

★ Persian mathematician Muḥammad ibn Mūsā al-Ḵwārizmī founded algebra.

Births

★ Rhodri ''Mawr'' ('the Great'), ruler of Gwynedd (Wales) (approximate date) (d. 878)

★ Photius I, Patriarch of Constantinople (approximate date) (d. 891)

Deaths

★ December 24 — Leo V, Byzantine Emperor (b. 775) (assassinated)

★ Tang Xian Zong, emperor of China (end of reign)