Source: SK-BRl (Bratislava) Rkp. 387 Missale NotatumFolio: 155rSequence: 2Full text: Semel juravi in sancto meo semen ejus in aeternum manebit et sedes ejus sicut sol in conspectu meo et sicut luna perfecta in aeternum et testis in caelo fidelisFeast: ApollinarisOffice: MASSGenre: CmCantus ID: g01279Image link: http://147.213.131.4:85/digi/Rkp_zv_387/LKB___RKP_ZV_387_____24TL/SK/1_1_0155R.h…