Musei Diocesi Latina Choral book.
XV Century.
Membrane register, carried out by a Lazio writing workshop, with binding consisting of wooden plates, leather covers and plates in embossed, engraved and perforated brass-plated sheet, belonging to the chapter archive of Santa Maria Assunta.
The Tetragrammaton and the square notation, also called Vatican notation, is a way of noting Gregorian chant.
Note the detail of the illuminated cap in gold, lapis lazuli, red lead and earth on parchment.
