Alvydas Nikžentaitis focused on the location of Trapėnai and determined that it was a triangle between Viešvilė, Ančia River (tributary of Šešuvis), and Veliuona. Further, he paid particular attention to "Ycoine" mentioned by Jean d'Outremeuse in connection with Margiris' duel with King John of Bohemia in 1329 and identified it with Jūkainiai village in the Raseiniai District. There are five hill forts within a distance from Jūkainiai, including the Molavėnai-Graužai hill fort (). In 1995, Gintautas Zabiela organized a survey of these hill forts and determined that one of them is likely not even a hill fort and other three, including Molavėnai, lacked sufficient cultural layer and archaeological artifacts. An archaeological excavation of Molavėnai outer bailey in 2009 found only a few minor items (fragments of clay pots, pieces of iron, stone grinders) that are dated to the 1st–5th century. Excavation of of the upper bailey produced no artifacts but revealed up to thick layer of clay (cf. earthen floor) used to increase hill fort's height which would date it to the second half of the 14th century.