Jakob Hurt Jakob Hurt was a notable Estonian folklorist, theologian, and linguist. was a notable Estonian folklorist, theologian, and linguist. He is also known as the "King of Estonian folklore". Jakob Hurt Jakob Hurt was a notable Estonian folklorist, theologian, and linguist. was an honorary alumnus of the Estonian Students' Society and he was featured on the 10 krooni (the Estonian kroon - former currency of Estonia) note.