Dausprugas' wife must have been Duke of Samogitia Vykintas' sister since Vykintas was an uncle of Tautvilas and Gedvydas.
The castle was the fortress where Vykintas, Duke of Samogitia and victorious leader of the Battle of Saule, defended himself against Mindaugas, crowned as King of Lithuania in 1253, during a civil war for power in the early Grand Duchy of Lithuania.