The term Angevin Empire is a modern term describing the collection of states once ruled by the Angevin Plantagenet dynasty.

The Plantagenets ruled over an area stretching from the Pyrenees to Ireland during the 12th and early 13th centuries, located north of the kingdoms of Navarre and Aragon. This "empire" extended over roughly half of medieval France, all of England, and some of Ireland. However, despite the extent of Plantagenet rule, they were defeated by the King of France, Philip II Augustus of the House of Capet, which left the empire split in two, having lost the provinces of Normandy and Anjou. This defeat, after which the ruling Plantagenets retained their English territories and the French province of Gascony, set the scene for the Saintonge and the Hundred Years' War.

The Angevin Empire is a neologism defining the lands of the Plantagenets: Henry II and his sons Richard I and John. Another son Geoffrey II, Duke of Brittany ruled Brittany and established a separate line there. As far as historians know, there was no contemporary term for the region under Angevin control; however descriptions such as "our kingdom and everything subject to our rule whatever it may be" were used. The term Angevin Empire was coined by Kate Norgate in her 1887 publication, England under the Angevin Kings. In France, the term Espace Plantagenêt (Plantagenet Area) is sometimes used to describe the fiefdoms the Plantagenets had acquired.

Genghis Khan (/ˈɡɛŋɡɪs ˈkɑːn/ or /ˈdʒɛŋɡɪs ˈkɑːn/,Mongol: [tʃiŋɡɪs xaːŋ] ( listen); 1162? – August 1227), born Temujin, was the founder and Great Khan (emperor) of the Mongol Empire, which became the largest contiguous empire in history after his death.

He came to power by uniting many of the nomadic tribes of northeast Asia. After founding the Mongol Empire and being proclaimed "Genghis Khan", he started the Mongol invasions that resulted in the conquest of most of Eurasia. These included raids or invasions of the Kara-Khitan Khanate, Caucasus, Khwarezmid Empire, Western Xia and Jin dynasties. These campaigns were often accompanied by wholesale massacres of the civilian populations – especially in Khwarezmia. By the end of his life, the Mongol Empire occupied a substantial portion of Central Asia and China.

Before Genghis Khan died, he assigned Ögedei Khan as his successor and split his empire into khanates among his sons and grandsons. He died in 1227 after defeating the Western Xia. He was buried in an unmarked grave somewhere in Mongolia at an unknown location. His descendants went on to stretch the Mongol Empire across most of Eurasia by conquering or creating vassal states out of all of modern-day China, Korea, the Caucasus, Central Asian countries, and substantial portions of modern Eastern Europe, Russia and the Middle East. Many of these invasions resulted in the large-scale slaughter of local populations, which have given Genghis Khan and his empire a fearsome reputation in local histories.