A treatise opposing a king of this name provides a rare scriptural justification for trial by ordeal to uphold one in which a knight fetched a stone from a vat of boiling water. Hincmar of Rheims attacked a king with this name for nonsensically claiming (15[1])that his wife got pregnant via sodomy with her brother. The Susanna Crystal may depict the attempt of a king of this name to annul his marriage to Theutberga and marry his concubine Waldrada. After being declared co-emperor by the (*) Ordinatio imperii, (-5[1])a man with this name led forces against his father (-5[1])at the Field of Lies in a rebellion (10[1])sparked by the latter’s remarriage to Judith of Bavaria. A man of this name founded a kingdom that was partitioned in the Treaty of Meerssen (“MAIR-sun”) and later became the Duchy of Lorraine. For 10 points, give this name (10[1])of a king (10[1])of Middle Francia who, with Louis the German (10[1])and Charles (10[1])the Bald, (10[1])signed the (10[1])Treaty of (10[1])Verdun. ■END■ (10[2]0[2])