 Maciej Stryjkowski claims that David was married to one of the daughters of Gediminas.He seems to have been a middleman between the pagan Gediminas and the Christian princes of the Rurikid family and frequently led in battle the united Lithuanian–Ruthenian armies.David is mentioned for the first time in 1314 when he helped to relieve a siege of Navahradak by the Teutonic Order.