The dragon-slayer Siegfried was born to Siegmund and Sieglinde, a pair of siblings who had committed great indiscretions. He was raised by Mime, the brother of King Alberich. Siegfried became a great hunter, though headstrong and impulsive. He forged the unbreakable blade Nothung, and embarked on a journey with Mime to ‘learn fear’ from the dragon Fafnir.