Earliest known date attached to four Gospels

[Phil]

Maybe this is of some help (if someone can read in German):

Title: E. Renan's Leben Jesu
Author: Daniel Bonifacius von Haneberg
Year: 1864

(I think this book is a comment about another book called The Life of Jesus, by Ernest Renan)

On page 58 we can read:

N??mlich in einer syrischen Handschrift der Vaticana (Cod. Syr. 91), welche verschiedene kirchliche Schriftst??cke enth??lt, ist vom Schreiber der Handschrift folgende Notiz eingetragen:
De quodam pervetusto Evangelio, quod exstabat in sacra Ecclesia AEdium Romaeorum in urbe Bagdado. Erat quodam Evangelium Edessennum (hoc est, Syriacum Edessae exaratum) pervetustum quidem, sed clarum ac dilucidum, ex quo ne jota quiden unum deletum fuerat, legebatur autem clarius quam libri recens exarati, & unus dumtaxat prior quinternio prae antiquitate ex eo exciderat. Ad ejus vero calcem ita scriptum erat.
Absolutus est sanctus iste liber Feria quinta, die 18. Canun prioris (hoc est, Decembris) Anno Graecorum 389 (Christi 78.) propria manu Achaei Apostoli, socii Mar Maris Discipuli Mar Adaei Apostoli, cujus oratio nobiscum sit Amen.

Translating the German bit with google translator

Namely, in a Syriac manuscript of the Vatican (Cod Syr. 91), the various church documents, is the writer of the manuscript entered the following note:

So it seems that the manuscript in question is: Cod Syr. 91

You can find this reference clicking here.