 It is unclear why, but Jaunutis, a middle son not mentioned in any written sources before the "coup d'état" accomplished by his brothers, was designated by Gediminas as his heir in Vilnius and consequently became the Grand Duke.His brother Kęstutis, Duke of Trakai, was assisting him in Samogitia.Despite help from Narimantas, Jaunutis was deposed by his brothers Algirdas and Kęstutis in 1345, just four years after Gediminas' death.