History of the Sabbath and First Day of the Week - John N. Andrews

Chapter 21
Traces of the Sabbath During
the Dark Ages
The Dark Ages defined -- Difficulty of tracing
the people of God during this period -- The
Sabbath effectually suppressed in the Catholic
church at the close of the fifth century -- Sabbathkeepers
in Rome about A.D. 600 -- The Culdees of
Great Britain -- Columba probably a Sabbathkeeper
-- The Waldenses -- Their antiquity -- Their
wide extent -- Their peculiarities -- Sabbatarian
character of a part of this people -- Important facts
respecting the Waldenses and the Romanists --
Other bodies of Sabbatarians -- The Cathari -- The
Arnoldistae -- The Passaginians -- The
Petrobruysians -- Gregory VII. about A.D. 1074
condemns the Sabbath-keepers -- The Sabbath in
Constantinople in the eleventh century -- A portion
of the Anabaptists -- Sabbatarians in Abyssinia and
Ethiopia -- The Armenians of the East Indies -- The
Sabbath retained through the Dark Ages by those
692