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The U-boat, short for Unterseeboot (undersea boat), was the name for submarines used by the German Navy during the First World War (1914-18) and Second World War (1939-45). In the two Battles of the Atlantic...

The Messerschmitt Bf 109, also known as the Me 109, was Germany's most important single-seater fighter plane throughout the Second World War (1939-45). Produced in greater numbers than any other German plane, the fighter was...

The Gallipoli Campaign took place in Turkey in 1915-16 during the First World War (1914-18). This major expedition involved British, French, Australian, and New Zealand (ANZAC) troops and was launched...

The Book of Kells (c. 800) is an illuminated manuscript of the four gospels of the Christian New Testament, currently housed at Trinity College, Dublin, Ireland. The work is the most famous of the medieval illuminated manuscripts...

Henry II of England ruled from 1154 to 1189 CE. He gained the throne by negotiation with his predecessor King Stephen of England (r. 1135-1154 CE) following the civil war that had raged between that monarch and Henry's mother...

An ice age is a period in which the earth's climate is colder than normal, with ice sheets capping the poles and glaciers dominating higher altitudes. Within an ice age, there are varying pulses of colder and warmer climatic conditions...

Publius Cornelius Tacitus (l. c. 56 - c. 118 CE) was a Roman historian, active throughout the reign of Trajan (r. 98-117 CE) and the early years of Hadrian (r. 117-138 CE). His best-known works are Histories and Annals, which cover the...

Sennacherib (r. 705-681 BCE) was the second king of the Sargonid Dynasty of Assyria (founded by his father Sargon II, r. 722-705 BCE). He is one of the most famous Assyrian kings owing to the part he plays in narratives in the biblical...

Diodorus Siculus or Diodorus of Sicily (active 1st century BCE) was a Greek historian, known for his universal history Bibliotheca Historica. Originally, it was a 40-volume monumental work, covering the history of the Mediterranean...

Operation Gomorrah (aka the Battle of Hamburg or Hamburg Air Offensive) was a sustained area bombing campaign of the German port of Hamburg in four night attacks by the Royal Air Force and two daytime...