books.google.co.in - From a decree of Charlemagne in 789 A.C. we see that human sacrifices were still common in his barbarous empire. especially among pagan Saxons. They did not begin to die out till the 9th century. Unable to prevent the sacrifice of cattle at ancient shrines, Gregory I (600 A.C.) instructed his missionaries...http://books.google.co.in/books/about/Encyclopedia_of_Religions_In_Three_Volum.html?id=FpXGJQeaatkC&utm_source=gb-gplus-shareEncyclopedia of Religions - In Three Volumes, Vol. III: N-Z
