What was the name of the father of the Grand Duke of Lithuania who reigned between 1315-1341?  
Karijotas: Karijotas or Koriat (baptized "Michal"; died between 1358 and 1363) was the Duke of Navahrudak (Lithuanian: "Naugardukas" ) and Vaŭkavysk (Lithuanian: "Valkaviskas" ), one of the sons of Gediminas, Grand Duke of Lithuania. Gediminas: Gediminas (  1275 – December 1341) was Grand Duke of Lithuania from 1315 or 1316 until his death.
Karijotas