820
Encyclopedia
Leap year starting on Sunday
This is the calendar for any leap year starting on Sunday, January 1 , such as 1956, 1984, 2012, 2040, or 2068.This is the only leap year with three occurrences of Friday the 13th, each three months apart in January, April, and July....
(link will display the full calendar) of the Julian calendar
Julian calendar
The Julian calendar began in 45 BC as a reform of the Roman calendar by Julius Caesar. It was chosen after consultation with the astronomer Sosigenes of Alexandria and was probably designed to approximate the tropical year .The Julian calendar has a regular year of 365 days divided into 12 months...
.
Asia
- TahirTahirIn Islamic context, Tahir refers to purity and cleanliness in accordance with religious rituals. It is also a name in several Islamic cultures.-Given name:*Mirza Tahir Ahmad, Pakistani Ahmadi...
, the son of a slave, is rewarded with the governorship of KhurasanGreater KhorasanGreater Khorasan or Ancient Khorasan is a historical region of Greater Iran mentioned in sources from Sassanid and Islamic eras which "frequently" had a denotation wider than current three provinces of Khorasan in Iran...
for supporting the caliphateCaliphateThe term caliphate, "dominion of a caliph " , refers to the first system of government established in Islam and represented the political unity of the Muslim Ummah...
. He rules independently of BaghdadBaghdadBaghdad is the capital of Iraq, as well as the coterminous Baghdad Governorate. The population of Baghdad in 2011 is approximately 7,216,040...
, not even mentioning the caliph's name in Friday prayers in recognition of caliphal authority.
Europe
- The Historia Brittonum is written (approximate date).
- Fedelmid mac Crimthainn assumes the kingship of MunsterMunsterMunster is one of the Provinces of Ireland situated in the south of Ireland. In Ancient Ireland, it was one of the fifths ruled by a "king of over-kings" . Following the Norman invasion of Ireland, the ancient kingdoms were shired into a number of counties for administrative and judicial purposes...
.
Science and technology
- MuslimMuslimA Muslim, also spelled Moslem, is an adherent of Islam, a monotheistic, Abrahamic religion based on the Quran, which Muslims consider the verbatim word of God as revealed to prophet Muhammad. "Muslim" is the Arabic term for "submitter" .Muslims believe that God is one and incomparable...
mathematician Muḥammad ibn Mūsā al-Ḵwārizmī founds algebraAlgebraAlgebra is the branch of mathematics concerning the study of the rules of operations and relations, and the constructions and concepts arising from them, including terms, polynomials, equations and algebraic structures...
.
Births
- Rhodri Mawr ('the Great'), ruler of GwyneddKingdom of GwyneddGwynedd was one petty kingdom of several Welsh successor states which emerged in 5th-century post-Roman Britain in the Early Middle Ages, and later evolved into a principality during the High Middle Ages. It was based on the former Brythonic tribal lands of the Ordovices, Gangani, and the...
(WalesWalesWales is a country that is part of the United Kingdom and the island of Great Britain, bordered by England to its east and the Atlantic Ocean and Irish Sea to its west. It has a population of three million, and a total area of 20,779 km²...
) (approximate date) (d. 878878Year 878 was a common year starting on Wednesday of the Julian calendar.- Europe :...
) - Photius I, Patriarch of ConstantinoplePatriarch of ConstantinopleThe Ecumenical Patriarch is the Archbishop of Constantinople – New Rome – ranking as primus inter pares in the Eastern Orthodox communion, which is seen by followers as the One, Holy, Catholic, and Apostolic Church....
(approximate date) (d. 891891Year 891 was a common year starting on Friday of the Julian calendar.- Europe :* Arnulf of Carinthia defeats the Normans at the Battle of Leuven....
)
Deaths
- December 25 – Leo VLeo V the ArmenianLeo V the Armenian was emperor of the Byzantine Empire from 813 to 820. A senior general, he forced his predecessor, Michael I Rangabe, to abdicate and assumed the throne. He ended the decade-long war with the Bulgars, and initiated the second period of Byzantine Iconoclasm...
, Byzantine Emperor (b. 775775Year 775 was a common year starting on Sunday of the Julian calendar. The denomination 775 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.-Africa:* Andalusian merchants set up an emporium on the...
) (assassinatedAssassinationTo carry out an assassination is "to murder by a sudden and/or secret attack, often for political reasons." Alternatively, assassination may be defined as "the act of deliberately killing someone, especially a public figure, usually for hire or for political reasons."An assassination may be...
) - Tang Xian ZongEmperor Xianzong of TangEmperor Xianzong of Tang , personal name Li Chun , né Li Chun , was an emperor of the Chinese Tang Dynasty...
, emperor of ChinaEmperor of ChinaThe Emperor of China refers to any sovereign of Imperial China reigning between the founding of Qin Dynasty of China, united by the King of Qin in 221 BCE, and the fall of Yuan Shikai's Empire of China in 1916. When referred to as the Son of Heaven , a title that predates the Qin unification, the...
(b. 778778Year 778 was a common year starting on Thursday of the Julian calendar. The denomination 778 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.- Europe :* August 15 – Battle of Roncevaux Pass...
) - Adi ShankaraAdi ShankaraAdi Shankara Adi Shankara Adi Shankara (IAST: pronounced , (Sanskrit: , ) (788 CE - 820 CE), also known as ' and ' was an Indian philosopher from Kalady of present day Kerala who consolidated the doctrine of advaita vedānta...
, Hindu sage (b. 788788Year 788 was a leap year starting on Tuesday of the Julian calendar. The denomination 788 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.- Europe :* Charlemagne conquers Bavaria.* Bermudo I...
).