Question: 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?
Sentence (from "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.
Relevant evidence: Yes