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All article is total nonsence. Dausprungas mensioned aoly one time 1219 and not as Grand price of Lithuania so from were in hell author get 1213? Sekond, Stensis is one of variants to him fathers, but not sons. Hin sons(probably- Dausprungas is only Mindaugas son we know, but according russians cronicles Mindaugas have more brothers)) was Tautvylas and Gedvilas.