A chronological outline of events from the beginning of the world to the taking of Constantinople by the Turks (called Agarenes in the manuscript title). It is of little value.
http://www.answers.com/topic/george-codinus

Now here in outline is the cause of this mass movement. A certain Celt named Peter, with the surname Koukoupetros, went off to worship at the Holy Sepulchre, and after suffering many frightful things at the hands of the Turks and Saracens who were plundering all of Asia, barely and only with great difficulty succeeded in reaching home. But he could not bear to have failed in his plan [to go to Jerusalem]. And so he wished to make a second journey, but realizing that it was not wise for him by himself to make the trip to the Holy Sepulchre (for something worse might happen to him), he worked out a clever scheme. It was to preach in all the lands of the Latins: "A divine voice has called me to proclaim before all the counts of France, that all [of you] should leave your homes and go off to worship at the Holy Sepulchre and with all your might and soul should strive to free Jerusalem from the hands of the Agarenes [Muslims]:
http://www.myriobiblos.gr/afieromata/1204/comnena_en.html