According to the story, Balaam‘s the Magician was adviser to the king of Egypt in Moses' time; Jethro, also one of the king's advisers, was driven away from the royal court after he tried to help the Jews in Egypt. The author also describes a number of miracles (not mentioned in the Bible) that supposedly occurred in Moses' youth and which saved him from disaster. Completely new stories were also added to Moses' biography, e.g., a very detailed tale about his becoming king of Ethiopia, after he had driven away Balaam who had seized the Ethiopian throne. In the story, Moses reigned for 40 years in the kingdom.

Latin title: De Vita et Morte Mosis Pibri tres. Gilbertus Gavlmyn Molinensis ex MS. exemplaribus, primus Hebraice edidit, Latina interpretatione & Notis illustrauit .... 1629.