World History: AD 820s
820~829
View on the mapEvents in this period 2
c. AD 820 · Middle East · Science
Al-Khwarizmi's Al-Jabr
The Concise Book of Calculation by Restoration and Balancing, commonly abbreviated Al-Jabr or Algebra, is an Arabic-language mathematical treatise on algebra written in Baghdad around 820 by Al-Khwarizmi. It was a landmark work in the history of mathematics, with its title being the ultimate etymology of the word "algebra" itself, later borrowed into Medieval Latin as algebrāica.
AD 828 · Korea · Economy
Jang Bogo establishes the Cheonghae Garrison
Chang Pogo, whose childhood name was Kungbok or Kungp'a (궁파), was a Sillan who rose to prominence in the Later Silla period of Korea as a powerful maritime figure who effectively controlled the Yellow Sea, and dominated the trade between Silla, Heian Japan, and Tang China for decades. His impressive fleet of ships was centered in Wando, an island in South Jeolla Province. So influential a figure did Chang become in late Silla politics that he was granted official office as maritime commissioner of the Cheonghaejin Garrison on Wando and came close to marrying his daughter into the Silla Royal House before his assassination in 841. He was worshipped as a god in China, Korea, Japan, and Vietnam following his death.
Descriptions are the opening paragraph of each Wikipedia article (CC BY-SA 4.0). Open an event for the full text and a link to the source.
Around the same time
- Coronation of CharlemagneAD 800
- House of Wisdomc. AD 830
- Carolingian Renaissancec. AD 789
- Capital moves to Heian-kyōAD 794
- Adi Shankara and Advaita Vedantac. AD 800
- Classic Maya collapsec. AD 800
- Borobudurc. AD 800
- Founding of the Khmer EmpireAD 802
- Rise of the Samanid EmpireAD 819
- Treaty of VerdunAD 843
- Founding of al-QarawiyyinAD 859
- Diamond SutraAD 868