A missal from 15th-century Germany, where the service for Magnus, 'apostle of the Allgäu' (Bavaria, 6 September), is contained partially here in the sanctorale with a note in the rubric on finding the rest of the service, 'Secretum et complenda de comune de confessore non pontifice...' in the common of a confessor, not a bishop.
Full Citation
New York, Columbia University, Burke Library at Union Theological Seminary, UTS MS 003, f. 219r