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Portrait of W. C. Röntgen after a photograph by Nicola Perscheld, 1906. Wellcome Collection.

The Second Crusade (1147-1149) was a military campaign organised by the Pope and European nobles to recapture the city of Edessa in Mesopotamia which had fallen in 1144 to the Muslim Seljuk Turks. Despite an army of 60,000 and the presence...

George Blaurock (l. c. 1491-1529) was one of the three founders of the Swiss Brethren (known by their opponents as Anabaptists) along with Conrad Grebel (l. c. 1498-1526) and Felix Manz (l. c. 1498-1527). His Origin of the Anabaptists is...

Manuel I Komnenos was emperor of the Byzantine Empire from 1143 to 1180 CE. Manuel continued the ambitious campaigns of his grandfather Alexios I and father John II to aggressively expand the boundaries of his empire. Manuel turned out to...

The discovery of X-rays – a form of invisible radiation that can pass through objects, including human tissue – revolutionised science and medicine in the late 19th century. Wilhelm Conrad Röntgen (1845-1923), a German scientist, discovered...

Matilda of Canossa (c. 1046-1115), the Countess of Tuscany (r. 1055-1115) and Vice-Queen of Italy (r. 1111-1115), was the final head of the noble House of Canossa following the deaths of her father in 1052 and her elder brother in 1055. One...

Frederick II (l. 1194-1250 CE) was the king of Sicily (r. 1198-1250 CE), Germany (r. 1215-1250 CE), Jerusalem (r. 1225-1228 CE), and also reigned supreme as the Holy Roman Emperor (r. 1220-1250 CE). He was born in Jesi in 1194 CE but spent...

The siege of Damascus in 1148 CE was the final act of the Second Crusade (1147-1149 CE). Lasting a mere four days from 24 to 28 July, the siege by a combined western European army was not successful, and the Crusade petered out with its leaders...

The Assassins (aka Nizari Ismailis), were a heretical group of Shiite Muslims who were powerful in Persia and Syria from the 11th century CE until their defeat at the hands of the Mongols in the mid-13th century CE. Secure in their fortified...

The German Crusade of 1197 CE, also known as the 'Emperor's Crusade', was led by the Holy Roman Emperor Henry VI (r. 1191-1197 CE). Although the emperor died on his way east, his army did capture Beirut from the forces of the Ayyubid dynasty...