Judging by the photographic evidence, it seems to have been destroyed by the same bombardment that destroyed the rest of the Old World
A while later - I'm thinking two or three generations, during which the survivors were brainwashed - this sort of creep pops up and writes "Botosani's first monograph"
First off, it claims these people did no go extinct in the 16th century - but instead existed on the shores of the Baltic until recently - when they were forcibly relocated in Ryazan due to losing a great war - which no history book speaks of