The cathedral in Chartres (Dept. Eure-et-Loire, France) was, like all cathedrals, not build overnight. It was finally consecrated in 1260 . Most of the building is thus from the 12th-13th century. A malacological theme can be seen in a relief of the rood screen (‘relief de jubé’) .
The relief has different symbolics, mainly animalistic; in the upper right corner a snail opposing a knight may be seen. Unless the other representations of this theme we have seen so far, the knight has dropped is weapons and seems ready to flee. The snail is winning!
 http://bit.ly/1c7kq1t (23.i.2014). Photo made by M. Hermanowicz/A. Abbinante © Région Centre – Inventaire général, ADAGP.