What is "bayernburg"

Bayernburg (German for "Bavarian Castle"; ) is the name of three separate wooden castles of the Teutonic Order in different locations along the Neman River in the Grand Duchy of Lithuania during the Lithuanian Crusade. Their exact locations are not known and historians provide conflicting versions. The first fortress was built in 1337 by guest crusaders, including Henry XIV, Duke of Bavaria, in whose honor it was named after Bavaria. Emperor Louis IV declared it the capital of the to-be-conquered Lithuania. The newly built castle withstood a 22-day siege by Grand Duke Gediminas, but was abandoned by the Order in 1344. The Teutons burned down the first Bayernburg and built a brand new fortress a little closer to Prussia. The second Bayernburg withstood a six-day Lithuanian attack in 1381 but was burned down in July 1384 by Vytautas when he betrayed the Order at the conclusion of the Lithuanian Civil War (1381–84). The third Bayernburg was built in spring 1387 where Georgenburg stood but the new name did not gain acceptance and the fortress continued to be known as Georgenburg. This fortress was captured and burned down by Vytautas in April 1403 during the first Samogitian uprising.