The disentangling the Gallican from the Roman elements in the early Western forms of service was undertaken by Louis Duchesne, who shows how the former partook of a funerary and the latter of a baptismal character.
De Rossi and Duchesne at once recognized in it phrases similar to those in the epitaph of Abercius.
Louis Duchesne, Le dossier du Donatisme, in: Mélanges d'archéologie et d'histoire 10, 1890, 628 f.
The edition of Louis Duchesne in the Liber Censuum de l'Eglise Romaine (I, Paris, 1905, 262-73), gave the text of the original of Cencius Camerarius with the variants of four other manuscripts.
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According to Louis Duchesne, he should be identified with Saint Lycerius whom the Gallia Christiana places lower in the list of bishops; he was patron saint of St-Lizier, the episcopal residence of the bishops of Couserans.
The biography of St. Tudgual, composed after the middle of the ninth century, relates that King Childebert had him consecrated Bishop of Tréguier; but Louis Duchesne argued that it was King Nomenoe who, in the middle of the ninth century, raised the monastery of Tréguier to the dignity of an episcopal see.