Which biblical figure is engraved upon the gem named for the son of King Lohair I?
Lothair Crystal: The Lothair Crystal (also known as the Lothar Crystal or the Susanna Crystal) is an engraved gem from Lotharingia in North-West Europe, showing scenes of the biblical story of Susanna, dating from 855-869. Lotharingia:  It was named after King Lothair II who received this territory after the kingdom of Middle Francia of his father Lothair I was divided among his sons in 855.
Susanna