Alexander Vygantas was the duke of which city in Lithuania?
Vygantas: Vygantas (baptized Alexander; Polish: "Wigunt" ; died June 28, 1392) was Duke of Kernavė. Kernavė: Kernavė was a medieval capital of the Grand Duchy of Lithuania and today is a tourist attraction and an archeological site (population 318, 1999).
Kernavė