Source: PL-WRu I F 411 Cistercian Gradual (Silesia)Folio: 008rSequence: 2Feast: Vigilia Nat. DominiOffice: MASSGenre: OffCantus ID: g00539Mode: 2TFull text: Tollite portas principes vestras et elevamini portae aeternales et introibit Rex gloriae