Fabricius (Bibl. Gr.
lib. 5. c.25) attributes the authorship of this Nomocanon to Doxapater Nilus, who, under Rogerius, in Sicily, about A. D. 1143, wrote a treatise, de quinque Patriarchalibus Sedibus
This was first published by Stephen le Moyne, in his Varia Sacra,
i. p. 211. Fabricius is probably correct, and it is not likely that Doxapater Nilus and Gregorius Doxapater were the same person.