Margiris, the defender of Pilėnai, is often suggested as the most likely candidate for the fourth brother. The chronicles of Hermann de Wartberge mention that in 1329 Gediminas and two of his brothers raided Livonia. By that time Vytenis was already dead and Fiodor was probably occupied with establishing himself in Kiev. One of these two brothers must then have been Vainius; the identity of the other still puzzles historians. Alvydas Nikžentaitis suggests that he was Margiris because sources attest to his high status and wealth. Sources mention one son of Margiris, who was captured by the Teutonic Knights soon after his father's suicide in 1336 and did not return.