CHRISTIAN HISTORY

IN ITS

THREE GREAT PERIODS

Second Period

THE MIDDLE AGE

BY

JOSEPH HENRY ALLEN

Late Lecturer on Ecclesiastical History in Harvard University

Porro subesse Romano Pontifici omni humanæ creaturæ declara-
mus dicimus definimus et pronuntiamus omnino esse de necessitate
salutis. - Bull "Unam Sanctam" of BONIFACE VIII.

BOSTON

ROBERTS BROTHERS

1884