The History of the Waldenses by J.A. Wylie
https://www.amazon.com/dp/B0BM3P3XMX

The Waldenses, also known as the Waldnesians or Vaudois, were a Christian movement of the later Middle Ages who lived in the Swiss Alps.
During the 12th century and onwards, the Waldenses were persecuted as heretics and endured near annihilation throughout the centuries. They were outlawed, hunted, tortured, murdered, and hated by the ruling Roman Catholic Church, because they lived by the Truth of God’s Word and did not ‘bow the knee’ to the traditions and laws of men. They kept the light of Christ burning amid the Darkness of the Middle Ages.

312 pages