Joh 8:12a: An Christological Exegesis of the Fourth Gospel within the scope of Primitive Christianity from the term Light of the World. The present dissertation, biblical and theological kind, had its results from a contemporary research on Johannine Christology. Tackling, particularly, from the term I am the Light of the World , as christological self-titling suitable for the Fourth Gospel, the relations to the Qumran s traditions and the helenistic s Jewish environment testified in the Essenia and literature of the Seventy. At the same time, there has been an attempt to make the Christological comprehension of the Johannine environment part of a broader one, which we designated a Primitive Chistianity.