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Seventh Crusade
The Seventh Crusade (1248-1254 CE) was led by the French king Louis IX (r. 1226-1270 CE) who intended to conquer Egypt and take over Jerusalem, both then controlled by the Muslim Ayyubid Dynasty. Despite the initial success of capturing Damietta...

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Sixth Crusade
The Sixth Crusade (1228-1229 CE), which for many historians was merely the delayed final chapter of the unsuccessful Fifth Crusade (1217-1221 CE), finally saw the Holy Roman Emperor Frederick II (r. 1220-1250 CE) arrive with his army in the...

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Eighth Crusade
The Eighth Crusade of 1270 CE was, like the Seventh Crusade (1248-1254 CE), led by the French king Louis IX (r. 1226-1270 CE). As previously, the idea was to attack and defeat the Muslims first in Egypt and then either reconquer or negotiate...

Definition
Saint Gregory the Illuminator
Saint Gregory the Illuminator or Enlightener (previously known as Grigor Lusavorich, c. 239 - c. 330 CE) was the first bishop of the Armenian church, and he is widely credited with converting king Tiridates the Great to Christianity, formally...

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Pyrrho
Pyrrho of Elis (l. c. 360 to c. 270 BCE) was a Greek skeptic philosopher credited with founding the school of Pyrrhonism which taught that one must resist making judgments or stating conclusions because sense perception did not correlate...

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Alexander Severus
Alexander Severus served as the Roman emperor from 222 CE until his untimely death in 235 CE. At the urging of his mother, aunt, and grandmother, Emperor Elagabalus named his cousin Alexianus (the future Alexander Severus) as his heir in...

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Council of Clermont
The Council of Clermont in central France was held in November 1095 and witnessed Pope Urban II's (r. 1088-1099) historic call for the First Crusade (1095-1102) to capture Jerusalem for Christendom from its Muslim occupiers. The Pope's speech...

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Romanos IV Diogenes
Romanos IV Diogenes ruled the Byzantine Empire from 1068 to 1071 CE. He was a military emperor, and his policies and campaigns served to shore up Byzantine defenses against the Seljuk Turks. However, in the aftermath of the Byzantine defeat...

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Constans II
Constans II (aka Konstans II) was emperor of the Byzantine Empire from 641 to 668 CE. Sometimes known as Constans Pogonatos (“the Bearded”), he came to the throne by a series of unlikely events and his empire was immediately challenged...

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Michael Psellos
Michael Psellos (1018 - c. 1082 CE) was a Byzantine historian, writer, and intellectual. Michael acted as courtier and advisor to several Byzantine emperors, and he was the tutor of Michael VII. Writing between 1042 and 1078 CE, his texts...