Mindaugas and his brother
Dausprungas are first mentioned among the
5 elder dukes in a 1219 treaty with
Galicia–Volhynia. Since at that time both brothers had to be relatively young, it implies that they inherited their high status. In the commentary of the 1219 treaty with Galicia–Volhynia it is noted that Mindaugas took the wife of Vismantas from the Bulionis family for himself. It is assumed that Vismantas' wife and Morta are the same woman. It is known that Vismantas died in 1252 in a battle against Mindaugas; however the date of Mindaugas and Morta's wedding is unknown. There is no consensus on how many children Morta had. The chronicles mention two sons, Replys and Gerstukas, in 1261. In 1263 two sons, Ruklys and Rupeikis, were assassinated together with Mindaugas. This is the only information available and historians disagree on whether these are the same two sons, whose name got distorted by
scribes, or they are four sons. There is no data on any rivals to the crown after the assassination, except for Vaišvilkas and Tautvilas; it would indicate that, whether there were two or four sons, they had perished in their youth. After Morta's death in 1262, Mindaugas took her sister (name unknown) as his wife despite her being married to
Daumantas. This cruel act motivated Daumantas to become an ally of
Treniota and assassinate Mindaugas with two of his sons. Treniota was Mindaugas' nephew. It is believed that he was son of Duke of Samogitia, either Vykintas or
Erdvilas. If it really was Vykintas, then there was a double marriage: Vykintas' sister married Dausprungas and Dausprungas' (and Mindaugas') sister married Vykintas. Erdvilas is mentioned only once in the 1219 treaty. The other nephew,
Lengvenis, played a role in Lithuanian state in 1242–1260. ==Graphic representation==