During the 20th century BC the Indo-European Hittites entered the region and gradually established a great empire which was destroyed by invaders in the 12th century.

During the period of Angkor Wat in the first half of the 12th century, additional half galleries on one side were introduced to buttress the structure of the temple.

During the 12th century, Arthur's character began to be marginalised by the accretion of " Arthurian " side-stories such as that of Tristan and Iseult.

During his campaigns in the early 12th century, Bolesław III Wrymouth reacquired Pomerania for Poland, and made the local " Griffin " dynasty his vassals.

During the 11th century, Lithuanian territories were included in the list of lands paying tribute to Kievan Rus ', but by the 12th century, the Lithuanians were invading neighboring territories themselves.

During the 12th century the town flourished culturally.

During the Crusades of the 12th to 13th century, this cruciform type of arming sword remained essentially stable, with variations mainly concerning the shape of the pommel.

During the inroads of the Goths, it was badly damaged in the fifth century and belonged in turn to the Goths, the kingdoms of Burgundy and of Arles, in the 12th century.

During the 11th and 12th centuries, Sweden gradually became a unified Christian kingdom that later included Finland.

During the 11th and 12th centuries, the Rheno-Mosan or Mosan art movement flourished in the region moving its centre from Cologne and Trier to Liège, Maastricht and Aachen.

During the 12th century, all trade between Norway and the Faroes, along with other tributary islands to the west, became centralised in Bergen.

* 1956: During the 12th IJK in Büsum, Germany, the committee of TEJO proposed that TEJO become the youth section and an integral part of UEA.

During the late 12th century, Joseph became connected with the Arthurian cycle, appearing in them as the first keeper of the Holy Grail.

During the 12th century, Rouen was probably the site of a yeshiva.

During the 12th century, when gargoyles appeared in Europe, the Roman Catholic Church was growing stronger and converting many new people.

During September 1943 he commanded the 12th Anti-Aircraft Brigade during the landing of Allied Forces at Salerno, Italy, Operation Avalanche.

During the 12th and 13th centuries, Perth was one of the richest trading burghs in the kingdom ( along with such places as North Berwick, Aberdeen and Roxburgh ), residence of numerous craftsmen, organised into guilds ( e. g. the Hammermen or Glovers ).

During the 11th century and early 12th century a second important transmission occurred with the lineages of Atisa, Marpa and Brogmi, giving rise to the other schools of Tibetan Buddhism, namely Kadam, Kagyu, Sakya, and Geluk ( the school of the Dalai Lama ).

During the 12th century, the boroughs of Saint Sernin ( San Saturnino or San Cernin ) and Saint Nicholas ( San Nicolás ) were established.

During the second game of the 2006 regular season, Griffey hit home run # 537, surpassing Mickey Mantle for 12th on the all-time list.

During the 11th and 12th centuries, the centralization of power had worn down the institutions of the Commonwealth, as the former, notable independence of local farmers and chieftains gave way to the growing power of a handful of families and their leaders.

During the Islamic conquest of India ( c. 12th c .), some forms came back to India as well, as evidenced in the N. Indian term māt ( mate, derivaative from Persian māt ) or the Bengali borey ( pawn, presumed der.

During the 12th century, German craftsmen and merchants known as the Transylvanian Saxons were invited to Transylvania by the King of Hungary to settle and defend the frontier of his realm.

During foreign invasions of India by Muslim warriors from the north west in the 12th and 13th centuries, the Brahmin community became dispersed all over India.

During the early part of this century, the Brown & Sharpe works in Providence were unchallenged as the largest single manufacturing facility devoted exclusively to precision machinery and tool manufacture anywhere in the world.

During the nineteenth century these views were protested by virtually all the Latin American writers, though ineffectively, just as the new nations of Africa and Asia protest them, with more effect, today.

During the 17th century, practical alchemy started to evolve into modern chemistry, as it was renamed by Robert Boyle, the " father of modern chemistry ".< ref name =" Deem, Rich 2005 ">

During the Late Bronze Age circa 2000 BC, they created an empire, the Hittite New Kingdom, which reached its height in the 14th century BC, controlling much of Asia Minor.

During the 1st century BC the Armenians in what had been Urartu established the powerful Armenian kingdom under Tigran who reigned throughout much of eastern Anatolia between the Caspian, Black Sea and Mediterranean.

During this period winter sports were slowly introduced: in 1882 the first figure skating championship was held in St. Moritz, and downhill skiing became a trendy sport with English visitors early in the 20th century, as the first ski-lift was installed in 1908 above Grindelwald.

During the post-World War I period ski-lifts were built in Swiss and Austrian towns to accommodate winter visitors, but summer tourism continued to be important ; by the mid-20th century the popularity of downhill skiing increased greatly as it became more accessible and in the 1970s several new villages were built in France devoted almost exclusively to skiing, such a Les Menuires.

During the Carolingian epoch the custom grew up of granting these as regular heritable fiefs or benefices, and by the 10th century, before the great Cluniac reform, the system was firmly established.

During the fourth century, the Roman emperors commonly employed foederati: Germanic irregular troops under Roman command, but organized by tribal structures.

During the post-Phoenician era of the eighth century a palace was erected and a port was also constructed, which served the trade with the Greeks and the Levantines.

During the 4th century BC, there may well have been some 250, 000 – 300, 000 people in Attica.

During the 5th century BC, the Acropolis gained its final shape.

During the 3rd century, under threat from a Herulian invasion, repairs were made to the Acropolis walls, and the " Beulé Gate " was constructed to restrict entrance in front of the Propylaia, thus returning the Acropolis to use as a fortress.

During the turn of the 20th century British Israelites carried out some excavations of the Hill of Tara in Ireland looking for the Ark of the Covenant – the Royal Society of Antiquaries of Ireland campaigned successfully to have them stopped before they destroyed the hill.

During the 5th century, the Anglii invaded Great Britain, after which time their name does not recur on the continent except in the title of Suevi Angili.

During the late 19th century, ideas about the legendary nature of Atlantis were combined with stories of other lost continents such as Mu and Lemuria.

During the first half of the 19th century, some of the songs African-Americans sang also began to appear in use for shipboard tasks, i. e. as shanties.

During the quarter century 1826-1850, 41 species and 6 genera of Apicomplexa were named.

During the early 20th century, Alicante was a minor capital that enjoyed the benefit of Spain's neutrality during World War I, and that provided new opportunities for the local industry and agriculture.

During the 19th century, the fields of science and art became increasingly intertwined as scientists such as Michael Faraday began to study the damaging effects of the environment to works of art.

During the 20th century communications used flags, morse code by radio, line and lights, voice and teleprinter by line.

During the next century Aegina was one of the three principal states trading at the emporium of Naucratis, and it was the only state of European Greece that had a share in this factory.

During the latter half of the 19th century, considerable public improvements were made to the town, which became, despite its neighbouring collieries, a pleasant place to live.