Immense amounts. Christian monasticism in particular was responsible for the loss of the vast majority of classical texts in the late roman and early medieval p

Immense amounts. Christian monasticism in particular was responsible for the loss of the vast majority of classical texts in the late roman and early medieval periods. It was only by the ~12th century that the image of the "wisdom-loving monk copying the classics" truly existed, in the almost a millennium prior they were almost always zealots bent on destruction of non-christian heritage.