Origins of Mass XVII

Viola

Returning after a long absence, and a move to a new job, hopefully to take advantage of the wealth of knowledge of forum members.
Please can anyone answer an interesting question posed by one of our cathedral choir.
Mass XVII originated in three different centuries, Kyrie 14th cent, Sanctus 11th cent, Agnus Dei 13th. Where did the three parts come from and when were they combined?
My thought was they were put together in Liber Usualis, late19th century, but I have no clue about their origins. Can anyone enlighten us?

AngelaR

I'm currently researching this myself.

I believe I found the Kyrie on the Cantus Index (top of page):
https://objects.library.uu.nl/reader/1874-327915?page=286

Parent page for the antiphoner containing the Kyrie is here: https://cantusdatabase.org/source/123641/

AngelaR

Sanctus: https://www.e-codices.unifr.ch/en/bcj/0018/361

Parent page: https://cantusdatabase.org/source/638308/

AngelaR

This is the closest I can find for the Agnus Dei. It includes a trope, which may account for the melodic discrepancies. Or this could be an entirely different chant. Edited to add: this Agnus is from the same manuscript as the Kyrie, so I'm going to lay a strong bet that this is the origin of Agnus XVII.

https://objects.library.uu.nl/reader/1874-327915?page=478

Parent page: https://cantusdatabase.org/source/123641/

Full text, with tropes: Agnus dei qui tollis peccata mundi miserere nobis
Agnus dei marie filius qui tollis peccata mundi dona nobis pacem
https://cantusdatabase.org/chant/497786/

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