Grand Duke Vytenis' origins are relatively well-established; he was the son of Butvydas, who was Grand Duke of Lithuania from 1291 to 1295. No consensus exists about the identity of Butvydas' father. While some genealogies give Traidenis as the ancestor, this has been described as unlikely: the later marriage of Gediminas' daughter Eufemija and Traidenis' great-grandson Boleslaw-Yuri would have violated canon law, since the two would have been related by blood, and this violation would likely have been noticed by the pope.