Who was the music from the Dark Ages named after?

Explanation:

This monophonic music was in the form of what is known as Gregorian Chant, named after Pope Gregory (590-604), who organized the chants into a specific order and had them published and communicated to churches throughout Europe and the Roman Empire , which had adopted the Roman Catholic tradition.

b. florence

d. milan

it met the katy line in vinita.

iv. it traveled through cherokee and quapaw tribal lands.