 According to most sources, the brothers were co-kings, managing the kingdom together, but there are sources indicating that Lev II was seated in Halych and Andrew in Vladimir-in-Volhynia (and yet others stating a similar arrangement, but with the seats reversed), which would seem to imply split jurisdiction.The first common letter of Lev II and Andrey dates to August 9, 1316, in which they renewed the union with the Prussian Crusaders (the Teutonic Order, also known as the Teutonic Knights), whom they promised to defend from the Tatars and "any hostile invader"; the latter mention apparently referred to the Grand Duchy of Lithuania, as that state at the time threatened not only the unity but also the very existence of both the Knights and the Galician state.It is reported that in the second decade of 14th century, the Lithuanians increased their pressure upon Galicia-Volhynia, eventually wresting away control of Dorohychyn and Berestia.