A ruler of this dynasty legendarily discovered the Coronation Gospels in a tomb where a ghost cursed him to die without any heirs. The first ruler of this dynasty briefly married the then-nun Hatheburg of Merseburg, causing their son Thankmar to be of questionable legitimacy, before remarrying the queen St. Matilda. The Liber Tertius recounting the rise of this dynasty was written by its contemporary Hrotvistha of Gandersheim. A ruler of this dynasty shared power with his canonized wife Adelaide of Italy. The East Francian king Henry the Fowler fathered the namesake of this dynasty, who defeated the Magyars at the 955 Battle (10[1])of Lechfeld and revived a title first given to Charlemagne. For 10 points, name this first German dynasty to rule the Holy Roman Empire. ■END■ (0[3])