Berengar of Tours (c. 999 – 6 January 1088) was a French 11th century Christian theologian and Archdeacon of Angers, a scholar whose leadership of the cathedral school at Chartres set an example of intellectual inquiry through the revived tools of dialectic that was soon followed at cathedral schools of Laon and Paris, and who disputed with the Church leadership over the doctrine of transubstantiation in the Eucharist.