Wikipedia page about this book: https://en.wikipedia.org/wiki/L%C4%81%C4%8Dpl%C4%93sis

Release date is 2006-01-02

"Bearslayer: A free translation from the unrhymed Latvian into English heroic" by Andrejs Pumpurs is an epic poem written between 1872 and 1887. Set during the Livonian Crusades, it follows the mythical hero Lāčplēsis, whose superhuman strength derives from a secret source. When Baltic gods gather to protect Latvians from Christian crusaders, Lāčplēsis must battle monsters, giants, and treacherous enemies. Alongside his beloved Laimdota and fellow hero Koknesis, he faces the Dark Knight in a climactic confrontation that will determine his people's fate. (This is an automatically generated summary.)

Original publication data not identified