Ulfberht Swords The Ulfberht swords are about 170 medieval swords found in Europe, dated to the 9th to 11th centuries, with blades inlaid with the inscription +VLFBERH+T or +VLFBERHT+. The word "Ulfberht" is a Frankish personal name that became the basis of a trademark of sorts, used by multiple bladesmiths for several centuries.