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Establishments – Disestablishments
The 9th century was a period from 801 to 900 in accordance with the Julian calendar.
The field of algebra was founded by the Muslim polymath Al-Khwarizmi. The battle between the Abbasid Caliph Al-Ma'mun and Islamic Scholar Ahmad ibn Hanbal occurred.
Around the 9th century the Edo people of what is now southeastern Nigeria developed bronze casts of humans, animals, and legendary creatures. These bronzes, which were used as vessels, amulets, pendants, and sacrificial tools, are among the earliest made bronzes ever found in Nigeria. Most items were part of a burial of a nobleman culture in the northern part of benin empire. Evidence of long distance trade between Benin and Portugal was also discovered through the thousands of glass beads found at Old Cairo at the workshops of Fustat.
The development of the Benin Kingdom can be attributed to the proficiency at advanced metallurgy seen in the bronze jewellery crafted by local artisans.
The Ghana (Wagadu) Empire (before c. 830 until c. 1235) was located in what is now southeastern Mauritania and western Mali. It is considered the first of the Sahelian Kingdoms, which would exist in some form until the early 20th century.
Britain experienced a great influx of Viking peoples in the 9th century as the Viking Age continued from the previous century. The kingdoms of the Heptarchy were gradually conquered by the Danes, who set up Anglo-Saxon puppet rulers in each kingdom. This invasion was achieved by a huge military force known as the Great Heathen Army, which was supposedly led by Ivar the Boneless, Halfdan Ragnarsson, and Guthrum. This Danish army first arrived in Britain in 865 in East Anglia. After conquering that kingdom, the army proceeded to capture the city of York (Jorvik) and establish the kingdom of Jorvik. The Danes went on to subjugate the kingdom of Northumbria and to take all but the western portion of Mercia. The remaining kingdom of Wessex was the only kingdom of the Heptarchy left. Alfred the Great managed to maintain his kingdom of Wessex and push back the Viking incursions, relieving the neighbouring kingdoms from the threat of the Danes following his famous victory over them at the Battle of Ethandun in 878. Alfred re-established Anglo-Saxon rule over the western half of Mercia, and the Danelaw was established which separated Mercia into halves, the eastern half remaining under the control of the Danes.
Ireland was also affected by the Viking expansion across the North Sea. Extensive raids were carried out all along the coast and eventually permanent settlements were established, such as that of Dublin in 841. Particular targets for these raids were the monasteries on the western coast of Ireland, as they provided a rich source for loot. On such raids the Vikings set up impermanent camps, which were called longphorts by the Irish—this period of Viking raids on the coasts of Ireland has been named the longphort phase after these types of settlements. Ireland in the 9th century was organised into an amalgam of small kingdoms, called tuatha. These kingdoms were sometimes grouped together and ruled by a single, provincial ruler. If such a ruler could establish and maintain authority over a portion of these tuatha, he was sometimes granted the title of High King.
Scotland also experienced significant Viking incursions during the 9th century. The Vikings established themselves in coastal regions, usually in northern Scotland, and in the northern islands such as Orkney and Shetland. The Viking invasion and settlement in Scotland provided a contributing factor in the collapse of the kingdoms of the Picts, who inhabited most of Scotland at the time. Not only were the Pictish realms either destroyed or severely weakened, the Viking invasion and settlement may have been the reason for the movement of Kenneth MacAlpin, the king of Dál Riata at that time. The kingdom of Dál Riata was located on the western coast of Scotland, and Viking incursions destroyed it after the death of its previous king, Áed mac Boanta in 839, according to the Annals of Ulster. This may have caused the new king, MacAlpin, to move to the east, and conquer the remnants of the Pictish realms. MacAlpin became king of the Picts in 843 and later kings would be titled as the King of Alba or King of Scots.
The 8th century is the period from 701 to 800 in accordance with the Julian Calendar. The coast of North Africa and the Iberian Peninsula quickly came under Islamic Arab domination. The westward expansion of the Umayyad Empire was famously halted at the Siege of Constantinople by the Byzantine Empire and the Battle of Tours by the Franks. The tide of Arab conquest came to an end in the middle of the 8th century.
The 800s decade ran from January 1, 800, to December 31, 809.
The 810s decade ran from January 1, 810, to December 31, 819.
The 820s decade ran from January 1, 820, to December 31, 829.
The 830s decade ran from January 1, 830, to December 31, 839.
The 840s decade ran from January 1, 840, to December 31, 849.
The 850s decade ran from January 1, 850, to December 31, 859.
The 860s decade ran from January 1, 860, to December 31, 869.
The 880s decade ran from January 1, 880, to December 31, 889.
The 890s decade ran from January 1, 890, to December 31, 899.
The 790s decade ran from January 1, 790, to December 31, 799.
The 780s decade ran from January 1, 780, to December 31, 789.
The 770s decade ran from January 1, 770, to December 31, 779.
The 750s decade ran from January 1, 750, to December 31, 759.
The 740s decade ran from January 1, 740, to December 31, 749.
Year 840 (DCCCXL) was a leap year starting on Thursday of the Julian calendar.
The 910s decade ran from January 1, 910, to December 31, 919.
Year 829 (DCCCXXIX) was a common year starting on Friday of the Julian calendar.
Year 839 (DCCCXXXIX) was a common year starting on Wednesday of the Julian calendar.
Year 886 (DCCCLXXXVI) was a common year starting on Saturday of the Julian calendar.
The year is 843 C.E., and the Carolingian Empire has reached the peak of its expansion, covering more territory in Western Europe than any one dynasty since the Roman Empire.