High Middle Ages

===Lithuania===
{{main|Grand Duchy of Lithuania}}
During the High Middle Ages Lithuania emerged as a [[Duchy of Lithuania]] in the early 13th century, then briefly becoming the [[Kingdom of Lithuania]] from 1251 to 1263. After the assassination of its first Christian king [[Mindaugas]] Lithuania was known as [[Grand Duchy of Lithuania]]. Unconquered during the [[Lithuanian Crusade]], Lithuania itself rapidly expanded to the East due to conquests and became one of the largest states in Europe.