The Ulfberht sword is a legendary medieval Viking weapon, renowned for its advanced craftsmanship and superior steel. Forged between the 9th and 11th centuries, these swords featured high-carbon steel, making them stronger and more flexible than typical medieval blades. Their superior metallurgy, resembling later crucible steel, gave warriors a significant edge in battle. Historians and metallurgists continue to study these swords, unraveling the secrets of their advanced forging techniques.