A while back I posted an image from an 11th century copy of the writings of Hrabanus Maurus which clearly depicted an early form of dagger. I believe I've found another such illustration, this time dating from the late 12th century.
While the weapon in question looks more like a knife, it is clearly being illustrated as a weapon, since the figure in question carries it with a shield or buckler.

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Saxes and shields have been a popular combination as well. ;)

But perhaps this picture is a bit too young to display a sax.

Sirs-If I remember correctly, commoner spearmen were often referred to as cousreliers sincce they carried a long knife (coustelle ) instead of a sword. In those times everyone carried a knife, and so it was easy for a commoner to get one.

Is not the "coustelle" the same thing as a "coustille"? And if so, was that not a 14th century weapon, rather than late 12th century?