Complex sentence: 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.
Split into simpler sentences: According to Louis Duchesne, he should be identified with Lycerius whom the "Gallia Christiana" places later in the list of bishops. Lycerius was patron saint of St-Lizier, the episcopal residence of the bishops of Couserans.