Around the year 1060 Williram von Ebersberg wrote a commentary on the Song of Solomon that was the most widely read commentary of its kind in the German Middle Ages. Here a critical textual analysis of this commentary is undertaken on the basis of all 46 extant versions dating from the 11th to the 16th century. It transpires that Williram circulated eight versions of his text. Each of these versions has been transmitted by a group of manuscripts whose interdependencies are examined and represented in a stemma. The interpretation of the author variants sheds light on the way Williram worked.