Abstract
During the second half of the 11th century (1049-1079), two controversies stirred ecclesiastical thought. In one, the archdeacon of Angers, Berengar, defended a real but non-corporeal interpretation of Christ's presence in the Eucharist. In the other, Latin and Greek clerics rediscovered ancient differences and debated, in particular, the type of bread used in the Eucharistic celebration.…