1200s
1200s may refer to: * The century from 1200 to 1299, almost synonymous with the 13th century (1201–1300). * 1200s (decade), the period from 1200 to 1209 See also * 1200s BC (decade) * 1200s BC (century) * 1200 (other) 1200 may refer to: * 1200 (number) Dates * 1200 CE (MCC), a year in the Western calendar, "A.D. 1200" ** 1200s (decade), the decade from 1200CE to 1210CE ** 1200s (century), the 13th century, from 1200CE to 1300CE * 1200 BC, a year in the Western ...

1200s BC (decade)
The 1200s BC is a decade which lasted from 1209 BC to 1200 BC. Events and trends *1207 BC **Pharaoh Merneptah claims a victory over the Israelites. **October 30 – Earliest known dateable solar eclipse. *1206 BC: Approximate starting date of Bronze age collapse, a period of migration, unrest and destruction in the eastern Mediterranean and Near East. *1204 BC: Theseus, legendary King of Athens, is deposed after a reign of 30 years and succeeded by Menestheus, great-grandson of Erichthonius II of Athens and second cousin of Theseus' father Aegeus. Menestheus is reportedly assisted by Castor and Polydeuces of Sparta, who want to reclaim their sister Helen from her first husband Theseus. Theseus seeks refuge in Skyros, whose King Lycomedes is an old friend and ally. Lycomedes, however, considers his visitor a threat to the throne and proceeds to assassinate him. (Other accounts place these events a decade earlier. See 1210s BC.) *c. 1200 BC: Start of Pan-Illyrians *c. 1200 BC: ...
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13th Century
The 13th century was the century which lasted from January 1, 1201 ( MCCI) through December 31, 1300 ( MCCC) in accordance with the Julian calendar. The Mongol Empire was founded by Genghis Khan, which stretched from Eastern Asia to Eastern Europe. The conquests of Hulagu Khan and other Mongol invasions changed the course of the Muslim world, most notably the Siege of Baghdad (1258), the destruction of the House of Wisdom and the weakening of the Mamluks and Rums which, according to historians, caused the decline of the Islamic Golden Age. Other Muslim powers such as the Mali Empire and Delhi Sultanate conquered large parts of West Africa and the Indian subcontinent, while Buddhism witnessed a decline through the conquest led by Bakhtiyar Khilji. The Southern Song dynasty would begin the century as a prosperous kingdom but would eventually be invaded and annexed into the Yuan dynasty of the Mongols. The Kamakura Shogunate of Japan would be invaded by the Mongols. Goryeo resi ...
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1200s BC (century)
1 (one, unit, unity) is a number representing a single or the only entity. 1 is also a numerical digit and represents a single unit of counting or measurement. For example, a line segment of ''unit length'' is a line segment of length 1. In conventions of sign where zero is considered neither positive nor negative, 1 is the first and smallest positive integer. It is also sometimes considered the first of the infinite sequence of natural numbers, followed by  2, although by other definitions 1 is the second natural number, following  0. The fundamental mathematical property of 1 is to be a multiplicative identity, meaning that any number multiplied by 1 equals the same number. Most if not all properties of 1 can be deduced from this. In advanced mathematics, a multiplicative identity is often denoted 1, even if it is not a number. 1 is by convention not considered a prime number; this was not universally accepted until the mid-20th century. Additionally, 1 is th ...
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