I was wondering how old is the current arrangement of the Sunday propers of the Traditional Mass.
I couldn't find anything related to this using the search function.
I know that some feasts are relatively new, like Christ The King, the Assumption, etc.
On the other hand, the Sunday propers are apparently very old. Does anyone know the origin of the current Sunday propers?
I remember someone mentioning elsewhere that they were fixed by St. Gregory The Great.
I mean, people have heard about the mustard seed on the VI Sunday After Epiphany for literally over a thousand years, right?
It kind of feeds your imagination doesn't it? I imagine my ancestors from the middle ages hearing this very same Gospel reading.
Does anybody have anymore information on this?

On the other hand, the Sunday propers are apparently very old. Does anyone know the origin of the current Sunday propers?
I remember someone mentioning elsewhere that they were fixed by St. Gregory The Great.

Lent has the earliest propers. Even the daily Masses of the Roman rite in Lent are extremely old and structured around the catechumens.

The texts of the Drogo sacramentary (c 850) are largely the same as the TLM. The Carolingian empire spread its customs throughout Europe and a lot of that remains in the traditional Roman rite.