The scope of this work is a methodical investigation of the account of Jesus'prayer between the Supper and the Arrest, as it is reported in the three synoptic gospels. In this respect it is an exegetical study. Its purpose is to determine as closely as possible the specific meaning which the authors of these accounts intended them to bear in the context of their own gospels. In this respect it is a study in biblical theology. The plan of the work is simple: part one is a detailed consideration of the empirical data of our problem in each of the synoptic accounts, dealing with the questions of textual criticism, exegesis and literary analysis. Part two is a theory of sources and redactions, which offers three explanatory hypotheses to answer the genetic questions raised by the data analyzed in part one. Part three is a theological synthesis of the meaning of the synoptic accounts and their sources, based on the findings of part one and two.