Poor little Agnes..sentenced to death by burning, her captors were vexed to find the wood would not light.
So they cut her head off instead.
She's often depicted holding a lamb..no real significance , it's just that her name sounds a bit like "lamb" in Latin-- really! (that's what wikipedia says anyway)
I just liked the paintings I've seen of this virginal little girl with a great big gash in her throat.
So I just swiped the idea.
In some images she is seen with a dagger in her throat--come to think of it that would have been much better!
might come back to this one..