1149 (The People's Chronology)
Scotland's David I bestows a knighthood on the 16-year-old Henry Plantagenet, son of Geoffrey of Anjou; young Henry acknowledges the Scottish king's right to Northumberland.
Raymond of Poitiers, prince of Antioch, is killed in June near Apamea by Nur ad-Din, ruler of Aleppo.
Venetian mercenaries regain Corfu for the Byzantines.
The Ghaznavid ruler Bahram Shah at Ghur in west-central Afghanistan poisons the Ghurid leader Qutb-ud-Din, who has taken refuge in the city of Ghazna following a family dispute. The Ghurid chief Ala-ud-Din sacks and burns the city in revenge, terminating the Ghaznavid clan's rule, but Ala-ud-Din will not be able to retain control of Ghazna (see 1173).
Theisir (al-Taysir) by the Arab physician Avenzoar (Abu Mervan ibn Zuh) describes otitis media, paralysis of the pharnyx, and pericarditis in a work based on personal experience, independent observation, and sound judgment. Opposing purgatives, Avenzoar strongly advocates venesection (phlebotomy).