Members of Assassins cult kill Conrad I of Jerusalem

In spite of his renowned vigour and intelligence, on 28 April 1192, Conrad was 
murdered just four days after becoming king...

Third Crusade 1189–1192:

On the left: Richard I of England (also known as Richard the Lionheart or Richard Coeur de Lion, 1157–1199). On the right: Saladin (or Sal al-Din al-Ayyubu, 1137–1193).

(Richard I and Saladin in combat during the Third Crusade).
Encaustic tiles, 1250–1260.
Chertsey Abbey, Surrey, England.
Conrad of Montferrat, who became king of Jerusalem during the Third Crusade, was widely regarded as one of the most impressive men of his generation. “Conrad was vigorous in arms, extremely clever both in natural mental ability and by learning, amiable in character and deed, endowed with all 
the human virtues, supreme in every council, the fair hope of his own side 
and a blazing lightning-bolt to the foe,” wrote one chronicler. But by that point, Conrad was also dead.
For Conrad, the spring of 1192 was dominated by a bitter feud with Richard I of England over the throne 
of Jerusalem. On 24 April, secure in his fortress at Tyre, Conrad heard the news that he had been elected king. Only four days later, however, the Assassins struck.
It was lunchtime, and Conrad was returning home from the house of his friend Philip, Bishop of Beauvais when he was accosted by two men, who plunged their daggers into his body. Death almost certainly came very swiftly. One of the murderers was killed on the spot; the other, wounded, was 
put to torture. It turned out that he was 
a member of the infamous Assassins, 
a Nizari Shia sect led by the ‘Old Man 
of the Mountain’, who supposedly encouraged them to gear themselves 
up for murder with copious amounts 
of hashish. 
In reality, many of the lurid stories associated with the Assassins were probably invented. The real author of the plot to kill Conrad was almost certainly somebody much closer to home: Richard the Lionheart. Indeed, when Richard was later imprisoned by Leopold of Austria, Conrad’s murder featured heavily on the charge sheet.
Dominic Sandbrook is a historian and presenter. His new series about Britain in the 1980s is due to air this summer on BBC Two.