On Images and their value.

This one is short but sweet. I have been looking for an online database of actual medieval images with verified dates to do my own research. I have stumbled upon the University of Heidelberg's digital library here: http://www.ub.uni-heidelberg.de/Englisch/helios/digi/handschriften.html

My first interesting image was this: http://digi.ub.uni-heidelberg.de/diglit/cpg848/0047
I have heard a few people talk of helms as being very difficult to attack and demonstrations of helms that for all intents are purposes can not be broken by a sword. This image clearly shows a knight's helm being cloven by a sturdy strike.