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Empress Irene was the wife of Leo IV and, on her husband's death, she reigned as regent for her son Constantine VI from 780 to 790 CE. From 797 to 802 CE she ruled as emperor in her own right, the first woman to do so in Byzantine...

The Crusader States (aka the Latin East or Outremer) were created after the First Crusade (1095-1102) in order to keep hold of the territorial gains made by Christian armies in the Middle East. The four small states were the Kingdom...

Hausaland, sometimes referred to as the Hausa Kingdoms, was a group of small independent city-states in northern central Africa between the Niger River and Lake Chad which flourished from the 15th to 18th century CE. The origins of...

The Jay Treaty, formally known as the Treaty of Amity, Commerce, and Navigation, Between His Britannic Majesty and the United States of America, was a controversial treaty signed by representatives of the United States and Great Britain...

Aaron Burr (1756-1836) was an American politician and lawyer, who served as the third vice president of the United States (1801-1805). His reputation as a US Founding Father was marred by his killing of political rival Alexander Hamilton...

The Anschluss ('fusion') of 12 March 1938 was the annexation and formal union of Austria with Germany. Adolf Hitler (1889-1945), the Nazi leader of Germany, dreamed of an empire which enclosed all German speakers, his 'Greater Germany'...

Adad Nirari I (r. 1307-1275 BCE) was the king of the Assyrian Empire who initiated the first major expansion of the Assyrian kingdom from the city of Ashur throughout the region of Mesopotamia. He also instituted what would become...

Sojourner Truth (l. c. 1797-1883) was an African American abolitionist, women's suffrage advocate, and civil rights activist who famously "walked away" from slavery in 1826, sued in court for the return of her son and, between...

In ancient China warfare was a means for one region to gain ascendancy over another, for the state to expand and protect its frontiers, and for usurpers to replace an existing dynasty of rulers. With armies consisting of...

The Silla kingdom ruled south-eastern Korea during the Three Kingdoms period from the 1st century BCE to 7th century CE. The capital was Geumseong (Gyeongju) with a centralised government and hierarchical system of social ranks. The prosperity...