Keywords: Tetragrammaton-Trinity-diagram-12thC.jpg A diagram on the Tetragrammaton divine four-letter name YHWH Hebrew יהוה ” or IEVE as it's transcribed into the Latin language here ” as a foundation of the Christian Trinity This is taken from a 12th-century manuscript of the ca 1109 A D work Dialogi Contra Iudaeos Dialogues against the Jews by Petrus Alphonsi / Petrus Alfonsi / Peter Alfonsi a convert to Christianity from Judaism The diagram shows the three persons of the Christian Trinity assigned to the three possible consecutive two-letter sequences of the Tetragrammaton YHWH / IEVE ” namely IE EV and VE These three sequences are in three circular nodes connected to each other by three lines making a triangle In the center supported by fanciful animals is a scroll with the complete Tetragrammaton The fanciful animals would not have been present in Petrus Alfonsi's original version of the diagram but were probably a personal decorative addition by the scribe who copied out this particular manuscript of the Dialogues The current-day relevance of this diagram is mainly that it influenced the development of the later Shield of the Trinity or Scutum Fidei diagram as well as influencing Joachim of Fiore's own different IEUE interlaced circles diagram which in turn led to the use of the Borromean rings as a symbol of the Christian Trinity http //www liv ac uk/~spmr02/rings/trinity html This is a cropped version of the image on page http //www joh cam ac uk/library/special_collections/manuscripts/medieval_manuscripts/medman/A/Web 20images/E4f153v htm which is a scan from folio 153v of Manuscript E 4 in the collection of the library of St John's College Cambridge University England This manuscript is referred to as manuscript J1 among the many surviving manuscripts of the Dialogus adversus Judaeos in the book Petrus Alfonsi and his Medieval Readers by John Victor Tolan 1993 ISBN 0813012384 century 12 unknown 12th century scribe For a different version of this diagram see File ALFONSI PETRUS 1110 Dialogi contra Iudaeos TETRAGRAMMATON Migne Vol 157 png See also http //www joh cam ac uk/library/special_collections/manuscripts/medieval_manuscripts/medman/A/Web 20images/D11f38v htm IEVE here PD-old-100 12th-century illuminated manuscripts Cambridge University Library manuscripts Trinity symbols Medieval diagrams Tetragrammaton |