World Timeline

AD 1084: The Seljuk Turks under Sultan Malik-Shah I conquer Byzantine Antioch, held by Philaretos Brachamios, an Armenian general, who seizes power as a usurper.
 
AD 1085: After 19 years of writing, Sīmǎ Guāng and his academic friends finished Zīzhì Tōngjiàn: Comprehensive Mirror for Aid in Government (資治通鑑) at 294 volumes and over 3 million words. It is considered the greatest history book in ancient China after Sīmǎ Qiān's Records of the Grand Historian (史記) (coincidentally, their authors' surnames are both Sīmǎ). Zīzhì Tōngjiàn is unique because of its dual-purpose as a history record and a politics textbook; Sīmǎ Guāng wanted to conclude emperors' gains and losses in the past so that future rulers could learn lessons from them.
 
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AD 1086: October 23 – Battle of Sagrajas: Spanish forces under King Alfonso VI ("the Brave") of Castile are defeated by the Moors and their allies, the Almoravids, who have been invited to help on orders by Emir Al-Mu'tamid ibn Abbad.
 
AD 1088: The Dream Pool Essays is published by the Chinese polymath scientist and statesman Shen Kuo. His book represents the earliest known writing about the magnetic compass, movable type printing, experimentation with the camera obscura only decades after Hasan ibn al-Haytham, which includes many different fields of study in essay and encyclopedic form, including geology, astronomy, archaeology, mathematics, pharmacology, magnetism, geography, optics, hydraulics, economics, military strategy, philosophy, etc. Some of Shen's most advanced theories include geomorphology and climate variability, while he improves Chinese astronomy, by fixing the position of the pole star and correcting the lunar error, by plotting its orbital course every night for a continuum of five years. Shen's book is also the first to describe the drydock in China – and discusses the advantages of the recent invention of the canal pound lock, over the old flash lock.
 
AD 1089: The Council of Melfi was hosted by Pope Urban II. The meeting declared simony (the buying and selling of positions in church) an ecclesiastical crime and decided to repair relationship between the Roman Church and the Greek Church.
 
AD 1091: 17 October - A tornado ravaged London, striking down over 600 houses. The first London Bridge built by William the Conqueror fell down. This was the first tornado recorded in British history. Historians estimate that the tornado had an intensity of T8 in Torro Scale, which means it had extreme wind speeds (96–107 m/s) and devastating power.
 
AD 1092: Summer – Emperor Alexios I Komnenos bribes one of Kilij Arslan's (sultan of the Sultanate of Rum) officials to recover Sinope (the capital of Paphlagonia), and neighbouring coastal regions. He uses the Byzantine fleet to defeat the Seljuk navy off the coast of Cius in Bithynia.
 
AD 1093: The city of Zagreb, nowadays the capital city of Croatia, was first mentioned in history when a Roman Catholic bishopric was established there.
 
AD 1094: October – Seljuk sultan Mahmud I dies after a 2-year reign. He is succeeded by his brother Barkiyaruq (one of the Seljuk princes who claim the throne) as ruler of the Seljuk Empire.
 
AD 1095: The Council of Clermont was held in Clermont, France. On the meeting Pope Urban II called on all Christians to fight against Seljuk Turks and reclaim Jerusalem; whoever joined in the war would be absolved of all sins. The First Crusade began.
 
AD 1096: King Alfonso VI ("the Brave") of Castile arranges to marry his daughter Theresa to Henry of Burgundy (House of Burgundy). Theresa's dowry includes the County of Portugal, given to Henry with Porto as the capital.
 
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