Fighting against the Seljuks, Georgia and the Crusaders developed fairly friendly relations. A 13th century anonymous Georgian author (conventionally known as the First Chronicler of Queen Tamar) as well as Abul-Faraj gives a version, though unproven otherwise, about the participation of a Georgian auxiliary force in the Siege of Jerusalem (1099). Some 300 Crusaders (known to the Georgians as Franks) are also known to take part in the famous Battle of Didgori (1121). King Baldwin II of Jerusalem is said by the historian Ioane Bagrationi, who refers to unknown medieval sources, to have visited incognito David IV’s court
Since the Bagrationi dynasty established the Tao-Klarjeti principality under the Byzantine protectorate in 813, representatives of the dynasty had been granted various Byzantine titles such as kouropalates, magistros, sebastos, etc. David was the last Georgian monarch to wear a Byzantine title.
Donald Rayfield, "Davit II", in: Robert B. Pynsent, S. I. Kanikova (1993), Reader's Encyclopedia of Eastern European Literature, p. 82. HarperCollins, ISBN0-06-270007-3.
