This country's ruler (*) Vytautas the Great militarily supported a cousin who was elevated to another country's throne after marrying Jadwiga in the Union of Kreva; together, those men won the Battle of Tannenberg against the Teutonic Knights, leading to this country's union with Poland.
This country was the original home of the Geminid dynasty and defeated the Mongols at the Battle of the Blue Waters. During the 1930's, this country's Iron Wolf Party was led by the nefarious Augustinas Voldemaras. The brothers Kestutis and Algirdas jointly ruled this country, which along with a southern neighbor forced the Peace of Thorn after defeating Ulrich von Jungingen. This country's ruler (*) Vytautas the Great militarily supported a cousin who was elevated to another country's throne after marrying Jadwiga in the Union of Kreva; together, those men won the Battle of Tannenberg against the Teutonic Knights, leading to this country's union with Poland. For 10 points, name this Baltic country, whose capital is Vilnius.
This country was the original home of the Geminid dynasty and defeated the Mongols at the Battle of the Blue Waters.
{Lithuania}