Which mythical character from medieval legend because popular during the era of Romantic nationalism and has a core unit of the Lithuanian Army name inspired by him?
Mechanised Infantry Brigade Iron Wolf: Mechanized Infantry Brigade "Iron Wolf" (MIB "Iron Wolf") (Lithuanian: "mechanizuotoji pėstininkų brigada "Geležinis Vilkas"" ) is the core unit of the Lithuanian Army and forms the country's contribution to NATO collective defence. Mechanised Infantry Brigade Iron Wolf:  The name of the brigade relates to the Lithuanian mythical character from the medieval foundation legend of the Vilnius city. Iron Wolf (character): The Iron Wolf (Lithuanian: "Geležinis Vilkas" ) is a mythical character from a medieval legend of the founding of Vilnius, the capital city of the old Grand Duchy of Lithuania and modern Republic of Lithuania. Iron Wolf (character):  The legend became popular during the era of Romantic nationalism. Iron Wolf (character):  Today Iron Wolf is one of the symbols of Vilnius and is used by sports teams, Lithuanian military, scouting organizations, and others.
Iron Wolf