Anonimo - Manoscritto liturgico - 1550

This document is a page from an ancient Latin liturgical manuscript, written in Gothic script and decorated with an illuminated initial.
The text shown is a very famous part of the Canon of the Catholic Mass (specifically the prayer Supplices te rogamus of the Roman Canon).
The large initial "S" of the word Supplices is finely decorated and colored (illuminated) with foliate motifs on a blue and yellow background.