350bc: In China, gears are first used.

767: 767 St Paul I ends his reign as Catholic Pope

800: Nov 23 Charlemagne arrives in Rome to investigate the alleged crimes of Pope Leo III.

850: Danish Viking raiders, led by King Rorik, conquer Dorestad and Utrecht (modern-day Netherlands).
Emperor Lothair I recognizes him as ruler of most of Friesland.

910: Battle of Tettenhall: King Edward the Elder attacks the joint-Kings Eowils and Halfdan of Norse
York. All three monarchs are killed in battle and the Viking army is decisively defeated by allied
forces of Mercia and Wessex. The co-Kings are succeeded by Ragnall ua Imair.

940: The tribe of the Polans begin the construction of the fortified settlements: Giecz, Bnin, Lad,
Gniezno, Poznan, Grzybowo and Ostrow Lednicki in Greater Poland.

974: Emperor Otto II (the Red) defeats the rebel forces of King Harald I (Bluetooth) at Danevirke,
who has invaded Nordalbingia (modern-day Holstein) to shake off imperial overlordship. Otto's armies
swiftly subdue the Danes, consolidating the frontier between Scandinavia and Northern Germany. Meanwhile,
Henry II (the Wrangler) begins an rebellion against his cousin Otto. He forges alliances with Bavarian
and Saxon nobles.

1002: English king Ethelred-Ii (the unready) launches the Saint Brice's Day massacre of Danish settlers.

1014: Jul 29 Battle of Strumitsa-valley: Byzantine destroys Bulgarian armies

1060: Bela-I is crowned king of Hungary.

1072: The Normans conquer Palermo, in Sicily.

1095: Pope Urban-Ii preaches the 1st Crusade.

1131: Louis-Vii (the Young) is crowned King of France.

1164: In the battle of Harim, Nur ad-din defeats the Crusader armies of the County of Tripoli and
the Principality of Antioch.

1180: Manuel-I Komnenos, the last emperor of the Komnenian restoration, dies. The Byzantine Empire
slips into terminal delcline.

1847: Bunson invents a gas burner. Lab teachers celebrate worldwide